1997 Fort Collins flood (folder 1 of 4)

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• • • • • 2 ot 2 08/06/97 16:55:57

• rainfall data mailb oxi,C Vs7C/14 ET SC.AP B OX ?id=0001 D838. 1235eno s goy &numb er=15

• SuNect:

rainfall data

fluttv;Pktfiti,(6;_kkAgit9.970:18 3177.

-0Y400

From:

Chuck Pettee@nps.gov

(Chuck Pettee)

• _{noidnscviiiiisses.atrhos.cotOstdte.eati, inswwaruito-2000.-net}

40

I ,understand you are compiling rainfall measurementscollected in the Fort Collins area on July 27-28. I have a fence post mounted wedge gage (5 inches capacity) in my backyard at 1636 Dogwood Court in Fort Collins. I recorded

40

15 mm at 5:30 am on July 28, 1997. I am sure it was empty

on Sunday afternoon but not sure what time it rained Sunday evening or night. I recorded 23 mm at 6:00 am on July 29,

41

1997. I was out of town between 6:00 am and 7:30 pm on

Monday so I do not know what time this rain fell. My phone number at work is (970) 225-3535 and at home is (970)

410

221-4658. Email is chuck_pettee@nps.gov Chuck Pettee • • • •

(3)

•

Rainfall

• Sukiect: Rainfall

• Mae:

Iiii1,%1Allfp,119.971}83t9 M.-40gfit)

From:

Bill_JacksonCvnps.gov (Bill Jackson)

16: mswsarito-i000:het

•

papiCycr7C/NET SCAP Elm B OX ?ic1=000200F6. I 235tanDs. gov &number= I

I heard you were looking for rainfall measurements during the July 28-29 storm.

I have a 'Vedge" type raingage in my backyard. I recorded 1.65 inches between Monday afternoon, July 28 and Tuesday morning, July 29. My address is 2418 Creekwood Drive, Fort Collins (near Drake and Lemay).

jadkson

40

(970 224-5377)

re66rded- i.b .inches ovde the-113:01. AugU-St

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• * DENFFADEN

• TTAA00 KDEN 061107

COZ006-011-014-017-020-070300-410

BULLETIN - IMMEDIATE BROADCAST REQUESTED

FLASH FLOOD WATCH

NATIONAL WEATHER SERVICE DENVER CO

410 505 AM MDT WED AUG 6 1997

...FLASH FLOOD WATCH FOR PORTIONS OF WEST CENTRAL COLORADO THIS

• AFTERNOON AND EVENING...

THE FLASH FLOOD WATCH IS IN EFFECT FROM NOON UNTIL 9 PM MDT...

• AND INCLUDES THE FOLLOWING LOCATIONS...

GRAND JUNCTION...MONTROSE...GUNNISON...PALISADE...FRUITA...

410 DELTA...RIDGWAY...PARADOX...NORWOOD...THE UNCOMPAHGRE PLATEAU...

THE COLORADO NATIONAL MONUMENT.. AND THE BLACK CANYON OF THE

GUNNISON NATIONAL MONUMENT.

410 A FLASH FLOOD WATCH MEANS THAT HEAVY RAINS MAY CAUSE STREAMS AND

CREEKS TO QUICKLY RISE OUT OF THEIR BANKS AND BRING A THREAT TO LIFE

• AND PROPERTY.

A STRONG WEATHER DISTURBANCE MOVING SOUTHEAST ACROSS WESTERN

• COLORADO WILL BRING ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS TO

THE AREA TODAY. COMBINING THIS DISTURBANCE WITH A VERY MOIST

ATMOSPHERE MEANS THAT THUNDERSTORMS WILL BE CAPABLE OF PRODUCING

110 VERY HEAVY RAIN IN A SHORT PERIOD OF TIME. RAINFALL RATES OF

2 INCHES OR MORE IN AN HOUR WILL BE POSSIBLE WITH THE STRONGER

STORMS.

410 SOME LOCATIONS IN THE WATCH AREA HAVE ALREADY RECEIVED HEAVY RAIN.

THE HEAVY RAIN HAS SATURATED THE GROUND...LIMITING THE ABILITY

• OF THE SOIL TO ABSORB ADDITIONAL RAINFALL. THEREFORE., ADDITIONAL

HEAVY RAIN MAY CAUSE EXCESSIVE RUNOFF AND FLASH FLOODING.

410 DO NOT DRIVE OR WALK INTO WATER OF UNKNOWN DEPTH. THE ROADWAY OR

PATHWAY MAY BE WASHED OUT.. AND WATER COULD BE MUCH DEEPER THAN YOU

THINK. KEEP CHILDREN AND OTHERS AWAY FROM FAST FLOWING WATER AND

411 STORM DRAINS..

.WHICH COULD BECOME DEADLY DURING HIGH WATER.

STAY TUNED TO NOAA WEATHER RADIO OR YOUR LOCAL NEWS MEDIA FOR THE

410 LATEST UPDATES AND POSSIBLE WARNINGS.

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410 NNNN

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TTI100 KDEN 012131

• COZ036-041-012200-

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SPECIAL WEATHER STATEMENT

• NATIONAL WEATHER SERVICE DENVER CO

330 PM MDT FRI AUG 01 1997

410 ...THUNDERSTORMS OVER SOUTHERN JEFFERSON COUNTY HAVE DISSIPATED...

411 THUNDERSTORMS MOVING OFF THE FOOTHILLS IN SOUTHERN JEFFERSON COUNTY

5 HAVE DISSIPATED ONCE THEY MOVED INTO DRIER MORE STABLE AIR ON THE

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PLAINS. HOWEVER REMNANTS OF THESE STORMS ARE EXPECTED TO DRIFT EAST

ACROSS WESTERN DOUGLAS COUNTY IN THE NEXT 30 MINUTES PRODUCING GUSTY

• DOWNDRAFT WINDS AND POSSIBLY A FEW SPRINKLES.

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411 FTMGJX

• KGJX WSR-88D NOTIFICATION

NATIONAL WEATHER SERVICE GRAND JUNCTION CO

330 AM MDT FRI AUG 01 1997

• El,

KGJK WILL BE SWITCHING TO UTILITY POWER SHORTLY.

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• WSR-88D OUTAGE NOTIFICATION

NATIONAL WEATHER SERVICE PADUCAH, KY

129 PM CDT MON AUG 04 1997

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COAGMET/NCWCD METEOROLOGICAL DATA FOR 8/3/1997

411 NORTH CENTRAL AREA

411

410

0

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410

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0.22 _0.25

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0.22

0.25 Corn

0.23

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0.24

0.21

0.24 Drybeans

0.24

0.22 _0.25

0.25

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0.25 Smallgrn

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0.25

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410 COAGMET/NCWCD METEOROLOGICAL DATA FOR 8/3/1997

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0.26

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0.24

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le name: KFKA.FCST

1-970-352-8080,41 selection 143 (KFKA FORECAST)

ISSUED: 0456 MDT, SUNDAY, AUGUST 03, 1997

STATION CALLS US

0457 A,C,B,T/T

1055 A,(B)

1530 SB,C,B

1-970-353-1310 Studio lane 970 356-1310 office (*10pause 40)

OUR GREELEY/WELD COUNTY FORECAST IS CALLING FOR...

Summer temperatures and a few thunderstorms can be expected the

next couple of days.

OUR NORTHERN COLORADO/SOUTHERN WYOMING FORECAST IS CALLING FOR...

TODAY: fair to partly cloudy with a 20 percent chance of an afternoon

thunderstorms.

TONIGHT: a 20 percent chance of an evening thunderstorm then clearing.

MONDAY: fair to partly cloudy with a 20 percent chance of an afternoon

or evening thunderstorm then clearing.

TUESDAY THROUGH THURSDAY... isolated afternoon and evening thunderstorms

and continued warm.

GREELEY/WINDSOR

90

60

•

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DENVER

90 CHEYENNE

86

56

88 ESTES PARK

75

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MOUNTAINS

mostly mid-60s to low 70s

BRIGGSDALE PURCELL

86 _c

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ROCKPORT CARR NUNN

85

56 FREDERICK FIRESTONE HUDSON

89 5i

KERSEY LASALLE PLATTEVILLE

90

0 LAWN WATER USEAGE TODAY WILL ABOUT .25 CALL THE GREELEY WATER UTILITY

FOR MORE INFORMATION at 350-9874.

Remember, around the clock you can call for the forecast at

352-8080. THIS IS METEOROLOGIST JFW ON KFKA.

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Monday

07/31/97 13:50:29

mailb oxiC °/07C/N ET S CAP _{E./mail/IN BOX7id-2...AAEOlaterra.}

cira. c olo state. e du &numb er=1

Subject: Monday

Date:

Thu,

_{31 Jul 1997 11:17:23 -0600}

From:

"Weaver,

John" <Weaver@CIRA.colostate.edu>

To:

_{"Jim Wirshbonr <msws@info2000.net>}

Jim -- Monday _{—was a very busy day for Poudre Fire.}

Wondered if a few obs you could share (Igot the rainfall _{totals you sent).} I'd like to get are T, TD, WS, WD, and cld cover _{for 1300 Local} Daylight, and for 2300 Local Daylight. _{No runh, but I want to keep} peculiar archive going.

*******************************

John F. Weaver NOAA/NESDISTRAMMt

CIRA Bldg., Foothill Campus

colorarlo 5ta.te

Ilniv

Fort Collins, CO 80523 weaver@cira.colostate.edu ph: 970-491-8342 fax: 970-491-8241 ********************************

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NOUS65 KG9 300824

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410 FREE TEXT MESSAGE

NATIONAL WEATHER SERVICE GLASGOW

MT

230 AM MST WED JUL 30 1997

410 07/30/97 0500 Z: IGGN

RDA

OUT FOR MAINTENANCE

FROM: 0500 Z TO: 1030 Z

0 ADJACENT WSR-88D5: KTFX, BLX, KMBX

RDA DOWN DUE TO FOCUS COIL PROBLEM

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(29)

GIF image 640x480 pixels http://orbit-netnesdis.noaa.gov:80/ora/fpdt1/pix/fcfld.gif

Ft. Collins Colorado Flash Flooding

-28

July 1997

- GOES-8 Infrared

04 2.2. JUL

(30)

•

$ DENSPSDEN

III

_{TTAA00 KDEN 101712}

C01030-032>050-110600-410

_{SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO}

NATIONAL WEATHER SERVICE DENVER CO 41/

1115 AM MDT SUNDAY AUGUST 10 1997

THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES

411

_ADAMS _ARAPAHOE _BOULDER _{CLEAR CREEK} _DENVER _DOUGLAS

ELBERT GILPIN GRAND JACKSON JEFFERSON LARIMER LINCOLN LOGAN AN PARK PHILLIPS SEDGWICK

411

_SUMMIT _WASHINGTON _MWER_°_LG_D

SYNOPSIS: COOL AND STABLE AIR COVERS THE LOWER ATMOSPHERE OVER

411

_{NORTHEAST COLORADO. A STRONG DISTURBANCE IN THE UPPER ATMOSPHERE}

WHICH IS NOW OVER UTAH WILL MOVE ACROSS THE AREA TONIGHT. THE COOL

411

MOIST AIR NEAR THE SURFACE WILL HOLD TEMPERATURES IN THE UPPER 60S_{AND LOWER 709 TODAY WHICH WILL PREVENT ANY SHOWERS OR THUNDERSTORMS}

FROM FORMING IN THE PLAINS HOWEVER WHEN THE UPPER LEVEL DISTURBANCE ARRIVES IT WILL BRING SHOWERS AND THUNDERSTORMS WITH IT. THESE WILL

411

_{MOVE TO THE EAST ABOUT 20-25 MPH SINCE THE FLOW ALOFT HAS INCREASED.}

RAINFALL AMOUNTS WITH THE AFTERNOON AND EVENING SHOWERS AND

411

_{THUNDERSTORMS WILL GENERALLY RANGE FROM 1/4 TO 1/2 INCH DUE TO THE}

RAPID MOVEMENT OF THE SHOWERS AND THUNDERSTORMS.. .HOWEVER A FEW LOCATIONS MAY GET AS MUCH AS 1 INCH OF RAIN. WHILE THIS RAINFALL • _{IS NOT EXPECTED TO PRODUCE ANY NEW FLOODING OF NOTE..}_{.SALVAGE AND} CLEANUP OPERATIONS IN PREVIOUSLY FLOODED AREAS MAY BE HAMPERED. IF HEAVY RAIN STRIKES AN URBANIZED AREA.. .STREET INTERSECTIONS AND • _{LOW LYING AREAS COULD BE BRIEFLY FLOODED.}

SPOTTER ACTIVATION IS NOT EXPECTED. •

•

END...GCF...WSFO DENVER

•

(31)

MOUNTAIN STATES WEATHER SERVICES'

REPORT

CONCERNING

FLASH

FLOOD

OF

JULY

28,

1997

FORT

COLLINS,

COLORADO

PREPARED

FOR:

Glenn Levy,

Battalion Chief,

Poudre Fire Authority

Fort Collins, Colorado,

Phone

970 221-6574

PREPARED

BY: Jim Wirshborn,

Chief

Meteorologist,

Mountain States Weather Services,

Fort Collins, Colorado,

Phone

970 484-9463

(32)

Mountain States Weather Services (MSWS), a private weather forecast and consulting firm, is under contract with the City of Fort Collins to provide forecast and warning services in support of emergency operations and public safety. We have been providing these types of services to governmental agencies, radio stations, industrial, the public and the media for more than 20 years. The current agreement with the City of Fort Collins calls for us to notify the City whenever MSWS or the National Weather Service (NWS) forecasts conditions relating to tornadoes, severe thunderstorms, flash floods or winter storms.

Specific to heavy rain and flood threats, MSWS is to provide forecast and updates relating to intense rains that move through the City with rainfall rates of one inch per hour or more that could cause extensive street flooding or stream flooding. In addition, MSWS is to relay NWS flash flood warnings or urban and small stream flood advisory information as it relates to areas within the city. MSWS may initiate "internal" flash flood warnings or "internal" urban and small stream flood advisories if forecasts and weather observations indicate this should be done.

See Letter of Agreement for Weather Services between the City of Fort Collins and Mountain States Weather Services, May 6, 1997 through May 5, 1998 for specific wording of responsibilities.

As part of our "good citizenship." MSWS relays to NWS, Denver reports of significant weather such as heavy rain, precipitation amounts, flooding and other related weather events that will help NWS to issue watches, warnings and advisories.

Part of the MSWS forecast and warning program is to maintain a weather spotter network which includes over 100 observers in Larimer and Weld Counties, Colorado and neighboring counties. For more than 20 years MSWS, in conjunction with NWS, has trained observers, provided observing procedure manuals and observer record forms, technical aides on when to report severe weather and how to make observations and when to call them into the MSWS office. The observation network gives MSWS a dependable and reliable set of observations that are used in conjunction with real-time satellite and doppler radar data received in the MSWS Forecast Office.

In addition, through radio weather broadcasts over the last 20 years MSWS has encouraged the public to call into our office when severe weather, heavy rain or flooding is observed. This is an important addition to the electronic data and the spotter network.

SEQUENCE OF EVENTS JULY 27-28, 1997

The following is a tabulation of advises issued prior to and during the event. It is clear from the faxes/e-mails that MSWS provided considerably more information than was required under the contract agreement with the City. This is my home town and this is how I have always treated my

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\

clients. Additional support during the flood and in the aftermath of cleanup made for a "continuous weather watch" and many statements and advisories were issued because it was clear that field operations were highly weather sensitive--much more so than routine activities and the criteria for critical weather had to be a much lower threshold than under normal conditions.

Further, it should be realized that when reviewing weather forecasts and warnings after the fact, reviewers have the advantage of "hindcasting" with the knowledge of what happened from a historical point of view when there is time to sort out details and analysis what occurred without the pressure of real-time interpretation and warning in the heat of the forecast and warning battle.

We did not keep logs of our calls to the National Weather Service or to other agencies. This type of bookkeeping takes much more time than a one-person staff has time to do. As a general rule any significant weather report received from our spotters, the public or an official agency is logged on our RECORD OF SPOTTER REPORTS and immediately we notify NWS, Denver. They keep a log of calls received, should you need to look it over.

0915 MDT, SUNDAY, JULY 27--severe weather outlook calls for 50 percent chance of thunderstorms through 2300 with the worst storms containing hail 1/2 inch in diameter and rainfall rates in excess of 3 inches per hour. It describes the slow movement expected by thunderstorms and calls for small stream and creeks and extensive urban flooding.

1720 MDT, SUNDAY, JULY 27--radar and forecast update. Reiterated potential for hail up to 1/2 inch in diameter and 3 inch per hour rainfall. States slow movement of storms could result in small stream and creek flooding and "extensive" urban flooding.

1810 MDT, SUNDAY, JULY 27--NWS small stream and urban flood advisory through 1900. NWS included Fort Collins. MSWS radar interpretation indicates rainfall of 1.5 inches in the last hour or so in foothills west of Fort Collins. No change in the MSWS forecast.

1910 MDT, SUNDAY, JULY 27--reiterated NWS urban and small stream flood advisory, including west Fort Collins.

1940 MDT, SUNDAY, JULY 27--NWS urban and small stream flood advisory extended through 2130. MSWS indicated heavy rains moving out of Larimer County and that high stream and urban street flooding would linger the next hour or so.

0415 MDT, MONDAY, JULY 28--MSWS issues an "internal" Flash flood watch for today and tonight indicating ground is saturated and the potential for another two to four inches of rainfall by midnight. Radar indicates heavy rain in eastern Larimer and western Weld County on already saturated ground.

The advisory indicates expected extensive small stream and creek flooding and urban street flooding with additional heavy rains of 2-3 inch per hour maximum rainfall rates. "All interests should be on a high alert status."

1000 MDT, MONDAY, JULY 28--NWS urban and small stream flood advisory for eastern Larimer County, including Fort Collins. MSWS reiterates the "internal" flash flood watch and indicates two to four more inches of rain possible by midnight.

1200 MDT, MONDAY, JULY 28--NWS urban and small stream flood advisory extended through 1400, including Fort Collins. MSWS "internal" flash flood watch today and tonight. Reports 5 inches of rain overnight and during the morning hours at the mouth of the Poudre Canyon but just a few hundredths of an inch in east Fort Collins.

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1530 MDT, MONDAY, JULY 28--MSWS continues "internal" flash flood watch and calls for a 70 percent chance of thunderstorms through midnight and 50 percent thereafter. The advisory indicates potential for maximum rainfall rates of 2.0 inches per hour and small stream and creek flooding along with urban street flooding and irrigation ditch overflows. After midnight thunderstorm maximum rainfall rates of 1 inch per hour are forecast.

1710 MDT, MONDAY, JULY 28--official NWS flash flood watch in effect through 2100. Advisory passed along Flash flood warning for southwest Weld County and radar indications of 1-2 inch per hour storms developing over eastern Larimer County and down through eastern Boulder County and a storm movement northnortheashvard of five to 10 mph.

This advisory also called for Fort Collins and eastern Larimer County to "be ready for extensive urban flooding and small stream and creek flooding during the next one to (two) hours as these storms hit the already saturated ground and overflow irrigation ditches."

The wording in this advisory was just short of issuing an "internal" flash flood warning for Fort Collins and eastern Larimer County. This is more than three hours before NWS issued the official flash flood warning.

1940 MDT, MONDAY, JULY 28--reiterated NWS flash flood watch and NWS urban and small stream flood advisory through 2100. Provided doppler radar rainfall rates of 1-2 inches per hour and indicated little movement to maybe a drift north at five to 10 mph. Continued emphasis on stream, creek, urban flooding and overflowing irrigation ditches at least through 2100.

At this point radar was probably underestimating rainfall rates. This is stated be examining the "after-the-fact" measurements from the public and spotters.

2040 MDT, MONDAY, JULY 28--reiterated NWS flash flood watch and urban and small stream flood advisory through 2100. This advisory indicated an "improving zone" starting to move into the county from the southwest. "The back edge of the rain and thunderstorms extends from Walden to Pinewood to Erie to east of Denver and this back edge is moving northeastward at 10 to 15 mph. "During the next hour to 90 minutes the heavy rains in Larimer County will end and by 2300 water

levels on streams and streets should subside. The rest of the night we'll have areas of fog, drizzle and a few light showers but should not have any more torrential rains till after noon Tuesday." Post analysis indicates that rains ended about 2230-2300 in the Fort Collins area. During this period we did not really realize how extensive and severe the flooding was. No one from dispatch had called. Basically MSWS called the observations of the radar and the spotters as we saw them and in a timely fashion relayed this information to the City.

However, with hindsight it would have been better to state something to the affect that while "rains would be ending shortly, the flooding would likely continue for several hours after the rain quit." It is important that we establish future vehicle to share information on the extent of an existing severe weather situation, specifically, it would have been helpful if dispatch would have convey to me how extensive the flooding was and the extent of what was happening. Other than one report at 2007 received from a MSWS weather spotter at Horsetooth Inlet Bay none of the calls MSWS received from spotters or the public indicated any flooding was occurring.

2115 MDT, MONDAY, JULY 28--reiterated NWS urban and small stream flood advisory and its extension through 2300. "During the next hour to two hours the heavy rains in Larimer County will end and water levels on streams and streets should subside thereafter. The last 15 minutes there has been some increase in rain intensity along and near the foothills. Flooding continues on urban streets and on some foothills location roads."

(35)

The radar showed the "improving zone" moving towardeastern Larimer County for the next few hours but in the short term 15 minutes rainfall in the immediate Fort Collins area continued heavily. Again, it would have been helpful to emergency operations ifthe advisory would have given a stronger word on how long the flooding would continue.

2141 MDT, MONDAY, JULY 28--called 911 and relayed NWS flash flood warning before it finished clearing our printer. Told dispatch to run crawler on cable override. Indicated we might not fax anything for a few minutes.

2145 MDT, MONDAY, JULY 28—hard copied NWS flash flood warning till midnight. (Note: this advisory was labeled 2245 instead of 2145. We did not send a correction because it did not change the content of the warning.) We did not "pad" this statement with adjectives such as "dangerous storm" because this was not for the public but was for our trained clients and concise, speCifiC information was needed.

2300 MDT, MONDAY, JULY 28--reiterated the flash flood warning till midnight and the flash flood watch. Radar indicated the storms decreasing in coverage and rate of fall. Passed along the heavy rain total from west of CSU main campus. Updated the forecast for the overnight hours. Through the following days MSWS continued to provide very detailed, timely "internal" watches and advisory to the City designed to help protect cleanup workers. These are delineated in the faxes/e-mails sent in real-time.

We encountered many instances where busy signals and phone related problems slowed the electronic process of e-mails and faxes in the days following the flood as the U. S. West phone system was overwhelmed by an overload of inbound and outbound calls. However no significant delays occurred on July 27-28 in getting information to dispatch. It would be advisable to shorten the fax list during crisis weather events.

CONCLUSIONS

None of us--not the National Weather Service or Mountain States Weather Services, predicted that the rain totals for this storm would exceed 11 inches, however, working together timely forecasts and warnings were issued.

"Internal" flash flood watches issued by MSWS were several hours ahead of those of NWS. This is not a critical statement about NWS but because they are dealing with a much larger area the size of several counties the timing of their watches is different than those of MSWS.

Both agencies were extremely accurate in predicting Ii

period rainfall rates of 2-3 inches per hour. Post analysis indicates the maximum rainfall rates may have approached 4 inches per hour. Both MSWS and NWS use a definition of "flash flood warning" that does not give the public or emergency managers any significant time. The term "watch" means some flooding may occur during the "watch" period while the term "warning" means flooding is already occurring or is imminent. By the time we get to the warning stage it is usually too late for people to get out of the way of the flooding as it is already occurring.

Even though we live in an age of mass communications, even a "perfect" forecast or warning would not reach everyone and there are always people who think it can't happen to them.

This is not to say as weather forecasters we should not continue to try to provide watches and llThsi.

(36)

*0

.

We feel there really needs to be more of a "ready," "set," "go" concept in the watch/warning procedure. The "ready" part of _{this would be using the current definition of a "watch" allowing the} public and emergency managers to attain a high level of awareness but realizing that the threshold for a watch would be set low enough that only about 25 percent of the watches would verify with flooding.

The "ready" part of this would be providing a move to higher ground message an hour or more before the actual flooding would take place. The nature of our ability to forecast this "ready" mode is still very limited, although more accurate doppler radar estimates of rainfall rates and the ability to change the radar estimate formula in a real-time mode may eventually allow this "ready" concept to come to use. As a forecaster my biggest concern with "ready" is it will still have a fairly high false alarm rate that may have a very negative affect on the consumer of such information when the next "ready" occurs. Extreme public education might make this idea marketable so long as the public knows that they will move to higher ground but may only see flooding 1 out of 4 times when the "ready" order is given.

The "go" part of _{the formula would continue to use the term and definition of}"flash flood warning."

As the City continues to evaluate the July 28, 1997 storm I would like to be involved in this process. I need definite feedback on how we might improve our advisories if they are unclear and would like to be involved in the design of some automated systems that might provide some input as to rainfall, rate of rainfall and stream flow. It is imperative that any automated system be powered by electricity that is not tied to the electrical system which can fail in floods—solar power would be suggested. It is imperative that the system transmit by satellite rather than phone lines which become undependable in flood events and other severe weather events and that what ever system is put in place it include public education to teach people about floods and so they will respond to emergency management orders when issued. Any automated rain gage should he of the weighing or optical variety rather than tipping bucket gages which grossly under estimate rainfall rates and totals when used in high intensity rainfall events.

Further details concerning future systems should be addressed in a separate report.

CERTIFICATE:

Submitted by August 22, 1997

(37)

CCL.mc

,((.€

THE FOLLOWING INFORMATION HAS BEEN COLLECTED BY MOUNTAIN STATES WEATHER SERVICES IN CONJUNCTION WITH THE FLASH FLOOD IN FORT COLLINS, JULY 28, 1997

KNOWN ERRORS IN 'HIE ORIGINAL DATA HAVE BEEN CORRECTED IN THIS DOCUMENT. EDITING HAS BEEN LIMITED TO CORRECTIONS AND MAKING INFORMATION CLEARER TI IAN IT WAS IN THE ORIGINAL MANUSCRIPT RECORDS.

ADDITIONAL NOTES HAVE BEEN ADDED TO AIDE IN DETERMINING LOCATION OF A STATION OR QUALITY OF DATA. AS A GENERAL RULE THE LOCATION IS

GIVEN AS A DISTANCE AND DIRECTION FROM A KNOWN LOCATION OR LANDMARK.

FOR FORT COLLINS WE USE THE CSU MAIN CAMPUS WEATHER STATION AS AN ANCIIOR POINT. FOR LOVELAND WE USE THE MIDDLE OF LAKE LOVELAND AS A REFERENCE POINT.

SPOTTER

REPORTS

SUNDAY,

JULY

27,

1997

TIME LOCATION OBSERVATION OBSERVER

1722 BELLVUE 1 I/2NW X I/4TRW +- 58/M/E0307 FQT LIGCG .70" IN 30 MINUTES

NORMA

1825 LOVELAND 3SW X ITRW i .75" IN MINUTES LARRY

1825 LIVERMORE 9NW X I/2TRW i'A 62/M/2006/017 .40" IN 10 MINUTES HEST() 1/4

CHERRY

1843 LOVELAND 3SW X I/4TRW+ 65/M/0000/ 1.00/1 HOUR 0800 Rum 1920 LOVELAND 3SW TRW- 2.50" STORM SO FAR RUTH 1935

HoRsFroart

1

INLET BAY

STORM TOTAL 2.42" PK WND 2730/1725 BARRY

MOUNTAIN

STATES

WEATIIER

SERVICES

OBSERVATIONS

ENDING APPROXIMATELY

0755,

MONDAY,

JULY

28, 1997

LOCATION

COUNTY

ELEV

I-II

LO

PRECIP

ARAPAHOE I4N CHEYENNE 4152 no report

13RUSI I 2SW MORGAN 4231 83 64 .76

13UCKHORN MOUNTAIN IF LARIMER 7400 76 52 .61

ESTES PARK 2I/2S LARIMER 8000 76 52 .03

FOR1 COLLINS 4E (MSWS OB) LARIMER 4920 85 61 .70

GREELEY UNC WELD 4715 86 64 .33

HAXTUN 4E PHILLIPS 4028 84 59 .04

HEREFORD WELD 5200 80 57 .20

1101INHOL1. RANCH LARIMER 7760 75 50 0

HOURGLASS LAKE LARIMER 9520 no report

HUDSON 4NW WELD 4900 85 64 .05

KARVAL 7NE LINCOLN 4870 98 61 .07

LAJUNTA 4NNE OTERO 4720 98 67 T

LAMAR PROWERS 3626 98 65 .17

LIMON 9N LINCOLN 5700 no report

LOVELAND 2N LARIMER 5040 81 58 1.30

MATIIESON 8SE 1.-113ERT 5830 88 59 .57

NEW RAYMER 6S MORGAN 4880 86 60 .24

NEW RAYMER 2IN WELD 5400 76 60 T

al'IS 14NNW WASHINGTON 4400 86 60 .26

(38)

PINE BLUFFS IONW LARAMIE 5250 84 59 T

POUDRE PARK LARIMER 5675 83 57 1.24

RANI) JACKSON 8620 68 43 0

RUSTIC 9WSW LARIMER 7750 73 51 T

SLATER 3E PLATTE 5250 78 58 0

STERLING I5WNW LOGAN 4450 80 60 .01

STRASBURG IN ADAMS 5350 no report

VIRGINIA DALE 7ENE LARIMER 7015 76 51 1.01

WELLINGTON 5WNW LARIMER 5260 74 58 1.48

OTI1Elt REPORTS

STATION PRECIPITATION/RAINGAUGE TYPE

FORT COLLINS 3NNE 1.50" (4-INCI I DIAMETER GAUGE)PUBLIC

LIVERMORE 4S 2.83" (4-INCH DIAMETER GAUGE) MSWS

SPOTTER

WINDSOR .62" (4-INCH DIAMETER GAUGE) MSWS

SPOTFER

I3ELLVUE IN 5.00"-F (1/2 INCH GLASS TUBE

OVERFLOWED) PUBLIC

ROCKPORT 15E 1.50" (4-INCH DIAMETER GAUGE) MSWS SPOTTER

LOVELAND 3SW 1.64" (4-INCH DIAMETER GAUGE) MSWS SPOTTER

FORT COLLINS 5S .60" (4-INCH DIAMETER GAUGE) LARIMER COUNTY EMERGENCY MANAGER

0720 PUI31,1(7 AND SI IERIFFS

DrpARTmENT

REPORT 6-8 INCHES OF WATER ON ROADWAY BETWEEN TOWN OF LAPORTE AND TEDS PLACE.

PUBLIC (JOE FRAIZER) LIMON 7SW REPORTED TORNADO HIT FARM ABOUT 1614 AND ENDED APPROX 1635. (WENT TO BASEMENT) THE TORNADO DID MAJOR ROOF DAMAGE AND WINDOW DAMAGE, AND KNOCKED DOWN 'FREES. AB1624E1629 }MST() 1/2, RAIN

1623-1830, 2.50 INCHES. GAUGE TYPE UNKNOWN. YOU MAY CALL FOR MORE DETAILS Al (719) 775-2790. THIS PERSON HAS CALLED ME BEFORE WITH OTHER REPORTS AND APPEARS REASONABLE.

(Later interview with Fraizer indicated they did not see a funnel as they were in the basement.)

0755 SHERIFFS DEPARTMENT SAYS IRRIGATION Dram IS OVERFLOWING IN LAPORTE AND IS CAUSE OF ABOVE FLOODING REPORT NEAR LAPORTE AND TEDS PLACE.

SPOTTER REpoicrs

MONDAY,

JULY

28,

1997

"FIME LOCATION OBSERVATION OBSERVER

0543 TORRINGTON KGOS OVC 10 65/M/0000 0" MONA

0550 FT MORGAN KSIR OVC 10R- 67/M/0000 KSIR

0610 FT COLLINS 3NNE 1.50" PUBLIC

0623 NEW RAYMER 21N ()VC: 20RW- 60/M/1506/026 76 60 T HAROLD 0630 RAND I3KN 60 43/M/1502/040 68 43 0" DON 0634 STERLING I5WNW OVC 15RW- 61/M/0503/022 80 60 .01" GARY 0635 ARAPAHOE I4N no report

0638 WELLINGTON 5WNW

X 1/2R-F 59/M/3602/024 74 58 1.48"

_ RITA

(39)

0638 }IL:AFFORD OVC 4R- 57/M/1502/032 80 57 .20" POLLY 0640 KARVAI. 7NE OVC 25 66/M/0502/ 98 61 0" KEITI I 0645 LIMON 7SW TORNADO B1614E1635 DAMAGED ROOF AND

WINDOWS, 'FREES KNOCKED DOWN A131624E1629 1-11.STO 1/2 RI31623E1830 2.50"

PUBLIC

0645 LIVERMORE 4S OVC 1/8R-F 56/M/0000/ 85 562.83" PHIL 0645 BUCKI1ORN mTN IF X 1/I6R-F 52/M/3603/ 76 52 .61" MOBY 0651 HoRsvroom INLET

BAY

OVC 2R-F 60/M/0000/011 88 56 3.51" BARRY

0653 LOVELAND 2N OVC 2F 61/61/0708/81 58 1.30" PAUL 0654 MATHESON 8SE: BKN 30 61/M/3402/025 PKWND 3338/1654 88 59

.57"

KATHY

0657 SLATER 3E OVC 20 60/M/E0908/ 78 58 0" CINDY 0659 VIRGINIA DALE

7ENE

OVC 1/2R-F 53/M/0503/029 76 52 1.01" VETA

0700 HUDSON 4NW OVC 21/2F 64/M/E0904/ 85 64 .05" DOT 0701 NEW RAYMER 6S ()VC 50 61/M/0000/027 86 60 .24" GENE 0703 PINE BLUFFS IONW OVC 15R- 59/M/1:0904/025 84 59 T SCOTT 0706 11011NHOLZ RANCH OVC 25 56/M/3604/ 75 500" PHYLLIS 0710 GREELEN UNC OVC 10 64/M/0905/030 86 64 .33" UNC 0713 OTIS I4NNW OVC 25 62/M/0000/023 86 60 .26" CARL 0717 ESTES PARK 2 1/2S OVC 10 54/M/0000/ 76 52 .03" ED 0720 BELLVUE IN RB1700 5.00" (GAUGE OVERFLOWED) BOB 0721 LAPORTE FLOODING BETWEEN VERNES AND LAPORTE

6-8" ON ROAD

PUBLIC

0731 WINDSOR .6/" MOLLIE,

0732 BRUSH 2SW OVC 25 64/M/E0504/ 83 64 .76" BOB 0735 HAXTUN 4F BKN 25 62/M/0510/020 84 59 .04" CLARK 0737 POUDRE PARK OVC 2F 58/M/0000/ 83 57 1.24" DONNA 0735 ROCKPORT 15E OVC 1/2R-F 58/M/0000/ 85 58 1.50" SHIRLY

0738 WI. 5S .60" ERIK

0745 LOVELAND 3SW OVC 1/2R-F 62/M/0000/ 82 60 1.64" RUTI I 0753 SHERIFFS OFFICE IRRIGATION DiTal OVERFLOWING Al'

VERNES IN LAPORTE

SI IERIFFS OFFICE

0755 RUSTIC 9WSW OVC IF 53/M/0000/ 73 51 T ARLENE

0807 LIVERMORE 9NW OVC 1/4R-F 57/M/0702/027 85 55 2.36" CHERRY 0819 LAPORTE IN 6.00" RW f (TYPE OF GAUGE BUCKET) PUBLIC

0858 FCI, II/2S .91" PUBLIC

0925 I IORSETOOTH INLET BAY .56" SINCE 0630 BARRY 0938 COUNTY ROAD 58 AND COLORADO 12 .55" PUBLIC 0940 WEST VINE/BASE OF FooTHILLS

STORM TOTAL -3.75", GAUGE-1" BY 7" CONE PUBLIC

0945 LOVELAND 3/4N 1.30" PUBLIC

0957 TAI:'[' AND WEST LAKE

3.00", GAUGE-GLASS TUBE PUBLIC

1000 LAPORTE 1i4E 3.77", 4" GAUGE PUBLIC

1040 VIRGINIA DALE 71-2NE

X I/16R-F 55/M/I805/028 .50" IN LAST 311R VETA

1046 WEST FORT COLLINS

1.20" PUBLIC

(40)

1448 mouni OF POUDRE CANYON

1.00" SINCE 0945, 5.98" STORM TOTAL PUBLIC

1515 TORRINGTON KGOS OVC 25 70/M/1007/ .01" GREG 1600 HORSETOOTH INLET

BAY •

.78" SINCE 0630 PLUS 3.51" OVERNIGHT, STORM TOTAL 4.29"

BARRY

1612 HUDSON 4NW X I/2TRW -+ M/M/E2705/ .55" IN 45 MINUTES FRED 1629 HUDSON 4NW X 1/2TRw

f

.50" SINCE 1612 FRED 1700 BRIGHTON 2NE 1/2TRWi- 63/M/0000/ 82 63 .72", .64" SINCE 1638 JIM 1735 FORT LUPTON 3N .56", MOST IN THE LAST HOUR ANDY 1805 !JUDSON 4NW ESTIMATED 2" SINCE 1630, WATER 3" DEEP IN

BASEMENT

FRED

1810 LIVERMORE 4S OVC 4R- 62/M/0901/ 5.01" PHIL

1815 LOVELAND 2 1/2S .35" IN 10 MINUTES JUDI

1842 1-25 AND US 34 MUDSLIDE EMERGENCY

MANAGEMENT

1842 US 287 BY-PASS MUDSLIDE EMERGENCY

MANAGEMENT 1854 liORSETOOTI I INLET

BAY

.40" 1745-1853 BARRY

1908 NORTH LORY STATE PARK

3.80" OVERNIGHT AND 2.40" THROUGH 7PM, STORM TOTAL 6.20", 4" GAUGE

PUBLIC

1930 WINDSOR .34" SINCE 0730 MOLLIE

2007 LOVELAND 2 I/2SW .25" SINCE 1815 JUDI

2010 HORSETOO'll 1 INLET BAY

2.12" SINCE 1745, FLOODING ON SPRING CREEK BARRY

2017 HORSETOOTH INLET BAY

.30" IN 7 MINUTES BARRY

2017 LAPORTE 2S 4.75" THROUGH 1800 AND CLOSE TO 2" SINCE 1800

SHEILA ,

2107 CI lEYENNE 12W .90" SINCE 1900, 1.00" PRIOR TO THAT HENRY 2203 VIRGINIA DALE 7ENE 1116RW f 58/M/2012/024 2.01" SINCE 0700, 1.94" SINCE 2000 VETA 2227 ,

QUAIL HOLLOW 3.00" 1930-2100 (W Kt.), STORM TOTAL 8.41" PUBLIC 2230 FORT COLLINS 1

I/2W

11.20" SINCE 1800. 4" GAUGE. STREET

UNDERWATER FOR 3 HOURS. NOTHING LIKE THIS IN 20 YEARS. (ADDRESS 2408 POPLAR)

PUBLIC

2239 OVERLAND AND POUDRE

10" SINCE YESTERDAY AM, STRAIGHT EDGE PAINT BUCKET, .75" LAST !JOUR.

KAM('

2243 VICINITY OF CITY PARK

2.50" LAST IIOUR PUBLIC

2244 NEW RAYMER 6S TRW t- OVI ID, .90" SINCE 2100 GENE 2245 1500 WEST LAKE 6" SINCE 0700, GAUGE TYPE-3/4"

DIAMETERE•FERETER GLASS

PUBLIC

2247 TAI."1 AND STUART STORM AS OF 0730 1.45", Al' 11AM 2.50", STORM TOTAL NOW 5.30", WEDGE GAUGE

-PUBLIC

2250 VIRGINIA DALE 7ENE

X I/8TRW+ 58/M/2006/025 1.47" SINCE 2200 STORM TOTAL SINCE 0700 3.98"

VFFA

2250 2200 SARBORA Cl' (WI. I/4W)

1.95" AS OF NOON, 4.25" AT 2000 WITH 3.50" IIIROUGH 2250, I" DIAMEFERETER GAUGE

PUBLIC

2257 BROWNS FARM 8" i- (QUES1IONAI3LE) PUBLIC

2315 VIRGINIA DALE 7ENE

X I/16R-F 57/M/1810/025 .13" SINCE 2243,24 11OUR TOTAL 4.11", STORM TOTAL 5.12" (CORRECTED EARLIER FROM 2250)

(41)

MOUNTAIN STATES WEATHER SERVICES

OBSERVATIONS ENDING APPROXIMATELY 0755, TUESDAY, JULY 29, 1997

LOCATION COUNTY ELEV HI LO PCPN

48-HOUR PRECIP

ARA1AII0E I4N CHEYENNE 4152 no report

BRIGHTON 2NE WELD -- 71 60 1.56 1.64

BRUSH 2SW MORGAN 4231 76 63 .75 1.51

BUCK! IORN MOUNTAIN IF LARIMER 7400 65 52 .52 1.13

ESTES PARK 21/2S LARIMER 8000 65 52 .14 .17

FORT COLLINS 4E (MSWS 013) LARIMER 4920 71 61 .60 1.20

GREELEY UNC WELD 4715 76 61 .29 .62

HAKFUN 4E PHILLIPS 4028 73 59 .44 .48

HEREFORD WELD 5200 71 57 .14 .34

11011NHOL/ RANCII LARIMER 7760 76 49 .28 .28

11ORSE1'OOTH INLET BAY LARIMER -- 68 59 6.40 9.91

11OURGLASS LAKE LARIMER 9520 no report

HUDSON 4NW WELD 4900 mm mm 7.50 7.55

KARVAL 7NE LINCOLN 4870 88 61 .69 .69

LAJUNTA 4NNE OTERO 4720 88 64 .70 .70

LAMAR PROWERS 3626 88 63 1.02 1.19

LIVERMORE 9NW LARIMER -- 66 56 .31 2.67

LOVELAND 2N LARIMER 5040 75 60 .80

, 2.10

MATHESON 8SE ELBERT 5830 75 57 .85 1.42

NEW RAYMER 6S MORGAN 4880 76 58 2.42 2.66

NEW RAYMEIZ 21N WELD 5400 73 59 .96 • .96

OTIS 14NNW WASHINGTON 4400 76 61 .28 .54

PUEBLO PUE131.0 4684 84 62 .10 .10

PINE BLUFFS IONW LARAMIE 5250 74 57 .21 ./1

POUDIZE PARK LARIMER 5675 70 59 .33 1.57

RAM) JACKSON 8620 74 43 .13 .13

RUSTIC 9WSW LARIMER 7750 63 53 T 'I'

SLATER 3E PLNI 1E 5250 66 56 .74 .74

STERLING I5WNW LOGAN 4450 75 58 .63 .64

S FRASBURG IN ADAMS 5350 no report

VIRGINIA DALE 7ENE LARIMER 7015 60 53 4.18 5.19

WELLINGTON 5WNW LARIMER 5260 68 59 2.85 4.33

ADDITIONAL OBSERVATIONS 24 IIOUR STORM TOTALS

LOCATION AMOUNT OF PRECIP GAUGE

LAKE LINDENMEIER (APPROX RA. 3NNE)

3.13" 4 INCH GAUGE

QUAIL HOLLOW (DRAKE/OVERLAND WEST OF FCL)

9.00" 1800-2230, STORM TOTAL 14.00"

COFFEE CAN

LEMAY'CONIFER (APPROX FCI. 2NNW) 3.14" 4-INCI I GAUGE VERNES PLACE 1/2NE (NEAR LAPORTE) 9.75" WEDGE GAUGE

NOR III LORY STATE PARK 8.35" 4-INCH GAUGE

WINDSOR .48", STORM TOTAL 1.10"

(MSWS OBSERVER)

4-INCI I GAUGE

PROSPECT/TAFT (RA, 2W) STORM TOTAL 11.90" 4-INCH GAUGE VINE AND OVERLAND (FCL 3NW) STORM TOTAL 10.00" CONE GAUGE

(42)

COUNTY RD 60 BETWEEN TAH AND OVERLAND

STORM TOTAL

6.6r

"CHEAP" GAUGE FORT

('Oil

.INS 1 1/2W (2408 POPLAR) STORM 'FOTAI. 11.20"+ 4-INCH GAUGE NORTI IWI S 1 FORT COLLINS STORM TOTAL 14.25" BUCKET?? FRONT RANGE COMMUNITY COLLEGE

I/2NE (SW FCI.)

STORM TOTAL 3.09" 4-INCH GAUGE

LIVERMORE 4S STORM TOTAL 5.52" (MSWS OBSERVER)

4-INCH GAUGE

DRAKE AND TAFT I/4W STORM Farm, 11.30" 4-INCH GAUGE LAPORTE l'2E VERNES STORM TOTAL 9.10"1- NONSTANDARD DRAKE AND SHIELDS STORM TOTAL 11.60" 4-INCH GAUGE

COLORADO STATE UNIVERSITY MAIN CAMPUS WEATHER STATION (OFFICIAL FORT COLLINS SINCE 1872) REPORTED 5.44 INCI1ES IN 24 HOURS ENDING 0800 THIS

MORNING AND 6.17 INCHES FOR *HIE STORM FROM SUNDAY NIGHT THROUGH 0800 THIS MORNING. THE 5.44" IS 'HIE BIGGEST 24 11OUR AMOUNT EVER.

spoTTER REPowrs

TUESDAY,

JULY

29, 1997

0540

Fowl- moRGAN

KSIR OVC 10 67/M 0000 KSIR 0545 ToRRINGToN KGOS ()VC 10 65/M/1207/020 72 62 .32" MONA 0550 HORSETOOTH INLET

BAY

X 3/4F 60/M/0000/005 68 59 6.40" STORM TOTAL 9.91"

BARRY

0610 BUCKHORN

rATN IF

X I/8F 52/M/0000/ 65 52 .52", STORM TOTAL 1.13"

MOBY

0615 RANI) OVC 60 48/M/0000/039 74 43 .13", STORM TOTAL .13"

DON

0620 NEW RAYMER 2IN OVC 2F 61/M/1513/020 73 59.96", STORM TOTAL .96- 2200-0130

HAROLD

0630 HEREFORD OVC 51: 59/M/I208/024 71 57.14", STORM TOTAL .34"

POLLY

0635 STERLING 15WNW OVC 3F 61/M/1508/022 75 58 .63", STORM TOTAL .64"

GARY

0640 KARVAL 7NE OVC 25 61/M/0000/ 88. 61 .69", STORM TOTAL .69"

KEITH

0645 LAKE LINDENMEIER .75" THROUGH 1800 LAST NIGHT TIII•N 2.38" OVERNIGI IT, 4" GAUGE

PUBLIC

0650 MATHESON 8SE OVC 20 58/M/1812/022 75 57 .89", STORM TOTAL 1.41"

KATHY

0652 LOVELAND 2N X 2F 61/61/0304/ 75 60 .80", STORM TOTAL 2.10" PAUL 0654 VIRGINIA DALE 7ENE X I/4F 54/M/0000/021 60 53 4.18", STORM TOTAL

5.19"

VETA

0655 SLATER 3E BKN 20 58/M/0000/ 66 56 .74", STORM TOTAL .74"

CINDY

0656 HUDSON 4NW STATION INACCESSIBLE, 7.50"

sToRm TOTAL

7.55"

FRED

0700

0702

NEW RAYMER 6S OVC 8 6 I /M/E0904/024 75 58 2.42", STORM TOTAL 2.66"

GENE

PINE BLUFFS 10NW OVC 15 57/M/E1512/017 74 57 .21", STORM 'FOTAL .21"

SCOTT

0706 HOHNIIOLZ RANCH OVC 25 52/M/0000/ 76 49 .28", STORM TOTAL .28"

PHYLLIS

0706 13RIGIIION 2NE OVC 1/2F 60/M/0000/018 71 60 1.56", STORM TOTAL 1.64"

(43)

0712 GREELEY UN(' OVC 1062/100/0000/023 74 61 .29", STORM TOTAL .62"

UNC

0715 OTIS 15NNW OVC 25 6 I/M/E0904/020 76 61 .28", STORM TOTAL .54"

CARL

0715 QUAIL HOLLOW (DRAKE AND

OVERLAND)

9.00" BETWEEN 1800-1030, 4" COFFEE CAN ESTIMATE 5-6" FROM 1700 SUN-MID AFIN MON

PUBLIC

0718 ESTES PARK 2 I/2S OVC 15 54/M/0000/65 52.14", STORM TOTAL .17"

ED

0720 LEMAY AND CONIFER

2.37" FROM 0600-0700 PLUS .77" PREVIOUS 24 FIRS, 4" GAUGE

PUBLIC

0720 WELLINGTON 5WNW X 3/4F 61/M/0000/ 65 52.14", STORM TOTAL .17" RITA 0723 VERNES PLACE I/2NE SUN NIGHT STORM .25" MON AM 3.50" AND

3.50" Al' 1800 ANOTHER 2.50" SINCE 0100 TUES, WEDGE GAUGE

PUBLIC

0725 NORTH LORY STATE PARK

SINCE 1900 2.15" FROM SUN AFTN TO 0730 MON 3.80", FROM 0730-1900 2.40", 4"GAUGE

PUBLIC

0730 WINDSOR .48", STORM

Tam,

Lir

,

MOLLIE 0731 BRUSH 2SW BKN 25 66/M/E1506/ 76 63 .75", STORM TOTAL

1.51"

BARB

0733 PROSPECT AND SOUTH TA F!'

SUN AFIN STORM 11.90", 4"GAUGE KEN

0734 HAXTUN 4E ()VC 25 61/M/1514/010 73 59.44" CLARK 0737 POUDRE PARK OVC IF 61/M/0000/ 70 59 .33", STORM TOTAL

1.57"

DONNA

0742 VINE AND OVERLAND

6.00" IN 16 HOURS (AFFN 4") CONE GAUGE PUBLIC

0755 RUSTIC 9WSW BKN 25 56/M/0000/ 63 53

T,

STORM TOTAL T DON 0814 LIVERMORE 9NW X 1/2F 62/M/I202/022 66 56 .31", STORM TOTAL

2.67"

CHERRY

0823 COUNTY ROAD 60 BETWEEN TAFT AND OVERLAND

STORM TOTAL 6.60" SINCE SUN NIGHT, "CHEAP" GAUGE

PUBLIC

0830 2209 VASSAR (1 BLK E OF COLLEGE NEAR UNIVERSITY MALL)

2.20" 24 'IRS ENDING 0600, PREVIOUS 24 HOURS .80", STORM TOTAL 3.00", 4"GAUGE

PUBLIC

0845 OVERLAND TRAIL HOLLYWOOD AND CI IERRY FCL 3NW

1700-2200 BUCKET 8" STORM 14.25" PUBLIC

1115 TORRINGTON KGOS OVC 25 69/M/0910/023 GREG

1255 FCL I/4N .64" ON SUNDAY , 2400 2.45" MONDAY STORM TOTAL 3.09"

MIKE

1300 LIVERMORE 4S .51" OVERNIGHT, 5.52" STORM PHIL 1319 EMERGENCY

OPERATIONS CENTER

I" /UR CRYSTAL LAKES ERIK

1500 DRAKE AND TAFT I/4W

2.62" THROUGH 1000 MON, ANOTHER 8.68" FROM 1000 YESTERDAY IIIROUGH 0900 THIS MORNING (11.30" STORM TOTAL), 4 INCH GAUGE

PUBLIC

1517 TORRINGTON KGOS OVC 25 74/M/I514/019 GREG

1530 LAPORTE I/2E VERNES

9.10" + GAUGE OVERFLOWED WITH 6.00- Al 1500 YESTERDAY

PUBLIC

(44)

SHIELDS , 1852 ESTES PARK 21/2N 31RW .30" 1830-1850 TN MOVG NE BEN _, 1936

110min-oar!!

INLET

BAY

1RW- BARRY

2014 VIRGINIA DALE 7ENE OVC 1/81'RW 1 58/M/3207/020 E.80" FROM 1951-2013

VETA

2054 VIRGINIA DALE 7ENE X l'2TRW-F 56/M/3204/021 1.94" 1951-CURRENT TIME TE

VETA

2218 VIRGINIA DALE 7ENE _ 3-4' WATER IN BOXELDER VETA

OBSERVATIONS ENDING' APPROXIMATELY 0755, WEDNESDAY, JULY 30, 1997

LOCATION COUNTY ELEV HI LO PCPN

24 HOUR

72-HOUR PRECIP

ARAPAHOE I4N CHEYENNE 4152 no report

BRUSH 2SW MORGAN 4231 82 66 .12 1.63

BUCK110IZN MOUNTAIN I E

LARIMER 7400 71 53 .10 1.23

FORT COLLINS 4E (MSWS OR)

LARIMER 4920 79 61 .99 2.19

GREELEY UNC WELD 4715 85 63 0 .6/

I IAXTUN 4E PHILLIPS 4028 72 60 .49 .97

HEREFORD , WELD 5200 78 59 .04 .38

1101INHOLZ RANCH !AMMER 7760 74 45 .02 .30

IIOURGLASS LAKE LARIMER 9520 65 47 T .10

IIUDSON 4NW WELD 4900 no report 7.55

f-KARVAI, 7NE LINCOLN 4870 84 60 .59 1.28

LAJ1/NTA 4NNE 0.1.1'.1(0 4720 89 . 69 0.70

LAMAR ['ROWERS 3626 85 69 .37 1.56

LOVELAND 2N LARIMER 5040 79 60 .01 2.11

MATIIESON 8SE ELI3ERT 5830 79 56 3.93 5.35

NEW RAYMER 6S MORGAN 4880 • 80 58 .31 2.97

NEW RAYMER 21N WELD 5400 76 59 .05 1.01

(yris 14NNW WASHINGTON 4400 80 61 .82 1.36

PUE131.0 PUEBLO 4684 85 62 .07 .17

PINE BLUFFS IONW LARAMIE 5250 83 57 .06 .27

POUDRE PARK LARIMER 5675 74 58 .13 1.70

RANI) JACKSON 8620 66 44 0 .13

RUSTIC 9WSW LARIMER 7750 73 53 .15 .15

SLATER 3E PLATTE 5/50 76

,

60 .51 1./5

STERLING I5WNW LOGAN 4450 76 60 3.48 4.12

STRASBURG IN ADAMS 5350 no report

VIRGINIA DALE 7ENE LARIMER 7015 71 50 2.02 7.21

W11.1 INGTON 5WNW LARIMER 5260 77 59 .68 5.01

OTHER REPORTS

STATION REMARKS

KARVAL 7NE RUSI I CREEK STILL FLOODING THIS

MORNING

(45)

MORNING RBI859E2140. MOSTLY I HR ENDING 2140

WELLINGTON 5WNW RB2000E2040

FORT COLLINS 4E RAIN FELL IN LESS THAN 50 MINUTES. NOTE THIS IS CORRECTED AMOUNT FROM REPORTS OF LAST NIGIIT.

MATHESON 8SE RBI935E2300

STERLING I5WNW RI31800E0430

SPOTTER

REPORTS

WEDNESDAY„IULY

30,

1997

0545 TORRINGTON KGOS OVC 10 62/97/1207/022 73 62 T MONA 0620 NEW RAYMER 2IN X 1/81: 62/M/1213/020 76 59 .05" HAROLD 0627 RAND BKN 100 44/M/1502/042 66 44 0" DON 0630 HEREFORD OVC 10 61/M/0908/025 78 59 .04" POLLY 0632 STERLING I5WNW OVC 51: 62/M/0000/020 RI31800E0430 76 60

3.48"

GARY

0642 KARVAI. 7NE OVC 25 61/M/0000/ RUSH CREEK ON OUTER BANKS 84 60 .59" KEITH 0654 MATHESON 8S1'. BKN SF 59/M/1809/024 PK WND 1238/202679 56 3.93" RI31935E2300 KATI1Y 0654 LOVELAND 2N BKN 45 62/60/3604/ 79 60 .01" PAUL 0655 BUCKIIORN

mm

I

F BKN 25 57/M/0000/ 71 54 .10- MOBY 0657 HUDSON 4NW NO ANSWER 0658 VIRGINIA DALE 7ENE BKN 20 54/M/2002/022 RB1859E2140 71 50 /.02" VETA

0659 NEW RAYMER 6S BKN 25 58/M/0000/019 80 58 .31" GENE 0700 PINE BLUFFS I ONW OVC 51: 59/M/0000/024 83 57 .06"

SCOTT

0701 1101INHOLZ RANCH SCT 30 46/M/0000/ 74 45 .02" PHYLLIS 0709 GREELEY UNC OVC 79/100/0505/025 85 63 0" UNC 0714 OTIS 14NNW OVC 25 7I/M/E1502/020 80 61 .82" CARL 0717 ESTES PARK 2 I/2S SCT 25 54/M/0000/ 72 50 .18" In 0721 WELLINGTON 5WNW BKN 4F 62/M/0000/019 RI32000E2040 77 59 .68" RITA 0730 WINDSOR .09" MOLLIE

0732 BRUSH 2SW BKN 25 71/M/E1506/ 82 66.12" BARB 0734 HAXTUN 4E OVC 4F 62/M 1 1514/020 72 60 .49" CLARK 0737 POUDRE PARK SC f 15 58/M/0000/ 74 58 .13" DONNA 0748 I IOURGLASS LAKE SCT 25 M/M/0000/ 65 47 T GEORGE 0753 RUS I IC 9WSW -SCT 25 56/M/0000/ 73 53 .15" ARLENE

1119 TORRING TON KGOS BKN 71/M/0913/022 GREG

1500 TORRINGTON KGOS 78/M/0914/018 GREG

1514 CRYSTAL LAKES 1.90" IN 30 MINUTES AROUND 1330 LATE REPORT, CURRENTLY SPRINKLING

PUBLIC

1533 WELLINGTON 5WNW

OVC 71' 73/M/1504/ 1'B32W RITA

1542 1101INIIOLZ RANCH .10" IN 15 MINUTES PHYLLIS 1800 GREELEY 1/2S 1.00" IN 30 MINUTES TRW4- STREET

FLOODING TO TI IF WEST

BARB

1830 GREELEY I/2S .50" IN 30 MINUTES BARB

2100 ROCKPORT 15ENE MSWS SPOTTER

TORNADO 132000 ON COLORADO 130R1)ER DAMAGE TO BUILDINGS, PORCI I, ROOF

(46)

DELAYED TORN OFF

OBSERVATIONS ENDING APPROXIMATELY 0755, THURSDAY, JULY 31, 1997

LOCATION COUNTY ELEV III LO 24 HOUR

PCPN

96 HOUR PCPN

ARAPAIIOE I4N CHEYENNE 4152 no report

13RIGIIION 2NE WELD -- 83 56 .88 2.70

BRUSH 2SW MORGAN 4231 86 64 .02 1.65

13UCKIIORN MOUNTAIN IE LARIMER 7400 74 54 .09 1.32

FOR I COLLINS 4E (MSWS 013)

LARIMER 4920 79 58 .01 2.20

GREELEY UNC WELD 4715 87 60 1.12 1.74

HAXTUN 4E PHILLIPS 4028 76 62 0.97

HEREFORD WELD 5200 83 56 .15 .53

11011N1101.1 RANCH LARIMER 7760 79 46 .41 .71

11OURGLASS LAKE LARIMER 9520 73 56 1.28 1.38

HUDSON 4NW WELD 4900 mm mm .47 8.0?1

KARVAL 7NE LINCOLN 4870 88 61 .01 .28

LAJUNTA 4NNE 0.1.1.,R0 4720 91 70 0.70

LAMAR PROWERS 3626 93 71 T 1.56

LIMON 9N LINCOLN 5700 83 58 0

LOVELAND 2N LARIMER 5040 80 56 .06 2.17

MATHESON 8SE E1.I3ERT , 5830 81 57 .05 .35

NEW RAYMER 6S MORGAN 4880 83 60 .?? 3.15

NEW RAYMER 21N WELD 5400 80 59 .07 1.08

OTIS 14NNW WASIIINGION 4400 86 64 .02 1.38

PUEBLO PUEI31.0 4684 91 61 0.17

PINE 131.UFFS IONW LARAMIE 5250 85 55 .15 .42

POLDRE PARK LARIMER 5675 77 54 .13 1.83

RANI) ,JACKSON 8620 72 47 1.11 I.24

RUSTIC 9WSW LARIMER 7750 73 51 .21 .36

SLATER 3E PLAIFE 5250 82 60 .93 2.18

STERLING 15WNW LOGAN 4450 82 62 .08 4.20

STRASI3URG IN ADAMS 5350 no report

VIRGINIA DALE 7ENE LARIMER 7015 mm mm .03

WELLINGTON 5WNW LARIMER 5260 mm mm .1. 5.01

WINDSOR WELD

--STATION REMARKS

STONEHAM Ii NNW 24 HOUR PRECIP ENDING 0500 WEDNESDAY

13 INCHES.

JUST EAST OF THIS SITE 15 INCIIES. ACCURACY UNKNOWN

STERLING 15WNW SAID PAWNEE CREEK WAS FIVE FEET

HIGHER IN .111IS 11.001) THAN THE JUNE 1965 FLOOD.