Alert archive / Colorado / Flash Flood Warnings in 1997
Flash Flood Warning 42, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Aug 5, 1997, 9:12 PM MDT for Larimer County, Colorado. It was in force for 108 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Aug 5, 1997, 9:12 PM MDT (03:12 UTC)
- Expired
- Aug 5, 1997, 11:00 PM MDT
- In force
- 108 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Larimer County, CO
The radar
The Cheyenne radar (KCYS), 69 km from the middle of the area, began a volume at 03:14 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 3.2 hours before the alert went out and 189 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 253 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 838 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -22 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDEN 060314
FFWDEN
COC069-060500-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
912 PM MDT TUE AUG 5 1997
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A FLASH FLOOD
WARNING EFFECTIVE UNTIL 1100 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN NORTH CENTRAL COLORADO
CENTRAL LARIMER
INCLUDING THE FOLLOWING LOCATIONS
FORT COLLINS...BELLVUE...BUCKHORN MOUNTAIN...HARMONY...
LIVERMORE...MASONVILLE...MISHOWAKA...PINGREE PARK...POUDRE PARK
AND TEDS PLACE
AT 910 PM MDT WEATHER SERVICE DOPPLER RADAR INDICATED MODERATE TO
HEAVY RAIN CONTINUING IN AND AROUND THE FORT COLLINS AREA. THE FORT
COLLINS POLICE INDICATED SOME STREET FLOODING IN THE WESTERN AND
DOWNTOWN FORT COLLINS AS WELL AS AROUND THE CSU CAMPUS. SOME
STREET FLOODING WAS REPORTED AT STURAT STREET AND COLLEGE AVENUE IN
THE VICINITY OF SPRING CREEK. CONSIDERING THE ABUNDANCE OF THE
CURRENT RAINFALL OVER THE LAST SEVERAL DAYS...EVEN ONE INCH OF RAIN
WILL CAUSE FLOODING.
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES.
ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS
AND STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.
TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
DENVER.
LAT...LON 4078 10504 4044 10498 4040 10521 4052 10561
4078 10549
RJKWhat forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Aug 5, 7:55 PM MDT, 1 hour 17 minutes before
COZ035-036-038>041-043-060230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER COLORADO 755 PM MDT TUE AUG 5 1997 ...SHOWERS AND THUNDERSTORMS PRODUCING ONE HALF TO ONE INCH OF RAINFALL OVER THE URBAN CORRIDOR... AT 755 PM WEATHER SERVICE RADAR INDICATED A LINE OF SHOWERS AND THUNDERSTORMS PUSHING ACROSS THE URBAN CORRIDOR...FROM FORT COLLINS TO THE SOUTHERN DENVER METRO AREA. RAINFALL MEASUREMENTS AND RADAR ESTIMATES INDICATE THESE SHOWERS WERE PRODUCING 0.50 TO 1.00 INCH OF RAIN AS THEY PUSHED SOUTHEASTWARD AT 25 MPH. PEOPLE ALONG THE FRONT RANGE URBAN CORRIDOR SHOULD BE ON THE LOOKOUT FOR MINOR URBAN FLOODING OF LOW LYING AREAS...DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS. RJK
Special weather statement, Aug 5, 8:00 PM MDT, 1 hour 12 minutes before
COZ035-036-038>041-043-060230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER COLORADO 755 PM MDT TUE AUG 5 1997 ...SHOWERS AND THUNDERSTORMS PRODUCING ONE HALF TO ONE INCH OF RAINFALL OVER THE URBAN CORRIDOR... AT 755 PM WEATHER SERVICE RADAR INDICATED A LINE OF SHOWERS AND THUNDERSTORMS PUSHING ACROSS THE URBAN CORRIDOR...FROM FORT COLLINS TO THE SOUTHERN DENVER METRO AREA. RAINFALL MEASUREMENTS AND RADAR ESTIMATES INDICATE THESE SHOWERS WERE PRODUCING 0.50 TO 1.00 INCH OF RAIN AS THEY PUSHED SOUTHEASTWARD AT 25 MPH. PEOPLE ALONG THE FRONT RANGE URBAN CORRIDOR SHOULD BE ON THE LOOKOUT FOR MINOR URBAN FLOODING OF LOW LYING AREAS...DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS. RJK
Special weather statement, Aug 5, 8:40 PM MDT, 32 minutes before
COZ035>050-061200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 840 PM MDT TUE AUG 5 1997 ...FLASH FLOOD WATCH FOR NORTHEASTERN COLORADO TO CONTINUE... THE FLASH FLOOD WATCH FOR MOST OF NORTHEASTERN COLORADO WILL CONTINUE THROUGH THE NIGHT. RAINFALL AMOUNTS OF 1 TO 2 INCHES HAVE BEEN REPORTED BY RADAR ACROSS THE URBAN CORRIDOR THIS EVENING ...WITH LIGHTER AMOUNTS OVER MUCH OF THE REMAINDER OF NORTHEASTERN COLORADO. A SERIES OF DISTURBANCES WILL BE AFFECTING NORTHEASTERN COLORADO DURING THE REMAINDER OF THE NIGHT. TIMING AND EXACT LOCATION OF THESE DISTURBANCES WILL BE DIFFICULT...BUT ALL AREAS OF NORTHEASTERN COLORADO BELOW ABOUT 8000 FEET WILL BE SUSCEPTIBLE TO HEAVY RAINS AND FLASH FLOODING. REMEMBER THAT HEAVY RAINS DURING THE PAST SEVERAL DAYS HAVE SIGNIFICANTLY DECREASED THE RAINFALL NEEDED TO PRODUCE SIGNIFICANT FLOODING. PERSONS ALONG SMALL STREAMS AND IN URBAN AREAS SHOULD BE PARTICULARLY ALERT FOR FLASH FLOODING. THERE WILL BE LITTLE TIME TO REACT AFTER THE HEAVY RAINS BEGIN AND NECESSARY PRECAUTIONS SHOULD BE TAKEN BEFOREHAND. TUNNELL/TA
Special weather statement, Aug 5, 8:42 PM MDT, 30 minutes before
COZ035>050-061200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 840 PM MDT TUE AUG 5 1997 ...FLASH FLOOD WATCH FOR NORTHEASTERN COLORADO TO CONTINUE... THE FLASH FLOOD WATCH FOR MOST OF NORTHEASTERN COLORADO WILL CONTINUE THROUGH THE NIGHT. RAINFALL AMOUNTS OF 1 TO 2 INCHES HAVE BEEN REPORTED BY RADAR ACROSS THE URBAN CORRIDOR THIS EVENING ...WITH LIGHTER AMOUNTS OVER MUCH OF THE REMAINDER OF NORTHEASTERN COLORADO. A SERIES OF DISTURBANCES WILL BE AFFECTING NORTHEASTERN COLORADO DURING THE REMAINDER OF THE NIGHT. TIMING AND EXACT LOCATION OF THESE DISTURBANCES WILL BE DIFFICULT...BUT ALL AREAS OF NORTHEASTERN COLORADO BELOW ABOUT 8000 FEET WILL BE SUSCEPTIBLE TO HEAVY RAINS AND FLASH FLOODING. REMEMBER THAT HEAVY RAINS DURING THE PAST SEVERAL DAYS HAVE SIGNIFICANTLY DECREASED THE RAINFALL NEEDED TO PRODUCE SIGNIFICANT FLOODING. PERSONS ALONG SMALL STREAMS AND IN URBAN AREAS SHOULD BE PARTICULARLY A\LERT FOR FLASH FLOODING. THERE WILL BE LITTLE TIME TO REACT AFTER THE HEAVY RAINS BEGIN AND NECESSARY PRECAUTIONS SHOULD BE TAKEN BEFOREHAND. TUNNELL/TA
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 2:16 PM MDT | Tornado Warning | BOU | Morgan, Weld | 29 min |
Nearby
Flash Flood Warnings in Colorado, 1997Every flash flood warning in 1997
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.