Alert archive / Colorado / Flash Flood Warnings in 1997
Flash Flood Warning 20, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 29, 1997, 8:00 PM MDT for Logan County, Weld County, Colorado. It was in force for 90 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 29, 1997, 8:00 PM MDT (02:00 UTC)
- Expired
- Jul 29, 1997, 9:30 PM MDT
- In force
- 90 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Logan County, CO, Weld County, CO
The radar
The Cheyenne radar (KCYS), 105 km from the middle of the area, began a volume at 02:03 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, 2.0 hours before the alert went out and 96 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
- 154 J/kg
- Mixed-layer CIN
- -82 J/kg
- Mixed-layer LCL
- 1447 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 67 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 300204 FFWDEN COC123-075-300330- FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DENVER CO 800 PM MDT TUE JUL 29 1997 ...FLASH FLOOD WARNING FOR PARTS OF WELD AND LOGAN COUNTIES HAS BEEN EXTENDED UNTIL 930 PM MDT... A FLASH FLOOD WARNING FOR PEOPLE IN EXTREME NORTHEASTERN WELD AND NORTHWESTERN LOGAN IN NORTHEAST COLORADO HAS BEEN EXTENDED UNTIL 930 PM MDT. THE FOLLOWING LOCATIONS ARE COVERED UNDER THE WARNING...WESTPLAINS AND THE PAWNEE NATIONAL GRASSLANDS. AT 755 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED TORRENTIAL RAINFALL OVER THE PAWNEE NATIONAL GRASSLANDS IN NORTHEAST WELD COUNTY AND EXTREME NORTHWEST LOGAN COUNTY. DOPPLER RADAR HAS ESTIMATES FROM 2 1/2 TO 4 INCHES OF RAIN IN WARNING AREA SINCE 630 PM MDT. THUNDERSTORMS OVER NORTHEAST WELD AND NORTHWEST LOGAN COUNTY HAVE SHOWN VERY LITTLE MOVEMENT IN THE PAST HOUR. SEVERAL SMALL STREAMS AND CREEKS ORIGINATING IN THE PAWNEE NATIONAL GRASSLANDS FLOW SOUTHEAST INTO NORTHWEST LOGAN COUNTY. STREAMS IN DANGER OF FLASH FLOODING INCLUDE COTTONWOOD... SPRING...TWOMILE AND CEDAR CREEKS. HIGH WATERS FLOWING DOWN TWOMILE AND CEDAR CREEKS FEED INTO STERLING RESERVOIR...12 MILES NORTH OF STERLING. PEOPLE IN AND NEAR THESE CREEKS SHOULD REMAIN ON THE ALERT FOR RAPIDLY RISING WATER. AN ADDITIONAL 1 TO 3 INCHES COULD FALL IN THE WARNING AREA BY 900 PM MDT. EXCESSIVE RUNOFF FROM THESE STORM WILL LIKELY CAUSE FLOODING OF SMALL CREEKS@ AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES AND ARROYOS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. BE PREPARED TO MOVE QUICKLY TO HIGH GROUND IF FLOODING OCCURS. BAKER
What 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, Jul 29, 6:38 PM MDT, 1 hour 22 minutes before
COZ041-044-045-300100- SPECIAL WEATHER STATEMENT ...CORRECTION FOR MISSING WORD... NATIONAL WEATHER SERVICE DENVER CO 638 PM MDT TUE JUL 29 1997 ...SMALL STREAM FLOOD ADVISORY HAS EXPIRED... THE SMALL STREAM FLOOD ADVISORY FOR SOUTHEASTERN DOUGLAS...EASTERN ADAMS AND ARAPAHOE...AND SOUTHWEST MORGAN COUNTIES IN NORTHEAST COLORADO HAS EXPIRED AS OF 615 PM MDT. AT 635 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT MOST OF THE THUNDERSTORM ACTIVITY HAD MOVED EAST OF THESE COUNTIES NO LONGER POSING A THREAT FOR FLASH FLOODING. HOWEVER... THUNDERSTORMS MAY REFORM IN THESE AREAS LATER THIS EVENING AS THE ATMOSPHERE REMAINS VERY MOIST AND UNSTABLE. A FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT MDT FOR ALL OF NORTHEAST COLORADO. BAKER
Special weather statement, Jul 29, 6:39 PM MDT, 1 hour 21 minutes before
COZ041-044-045-300100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 638 PM MDT TUE JUL 29 1997 ...SMALL STREAM ADVISORY HAS EXPIRED... THE SMALL STREAM FLOOD ADVISORY FOR SOUTHEASTERN DOUGLAS...EASTERN ADAMS AND ARAPAHOE...AND SOUTHWEST MORGAN COUNTIES IN NORTHEAST COLORADO HAS EXPIRED AS OF 615 PM MDT. AT 635 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT MOST OF THE THUNDERSTORM ACTIVITY HAD MOVED EAST OF THESE COUNTIES NO LONGER POSING A THREAT FOR FLASH FLOODING. HOWEVER... THUNDERSTORMS MAY REFORM IN THESE AREAS LATER THIS EVENING AS THE ATMOSPHERE REMAINS VERY MOIST AND UNSTABLE. A FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNHIGHT MDT FOR ALL OF NORTHEAST COLORADO. BAKER
Special weather statement, Jul 29, 6:40 PM MDT, 1 hour 20 minutes before
COZ041-044-045-300100- SPECIAL WEATHER STATEMENT ...CORRECTION FOR MISSING WORD... NATIONAL WEATHER SERVICE DENVER CO 638 PM MDT TUE JUL 29 1997 ...SMALL STREAM FLOOD ADVISORY HAS EXPIRED... THE SMALL STREAM FLOOD ADVISORY FOR SOUTHEASTERN DOUGLAS...EASTERN ADAMS AND ARAPAHOE...AND SOUTHWEST MORGAN COUNTIES IN NORTHEAST COLORADO HAS EXPIRED AS OF 615 PM MDT. AT 635 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT MOST OF THE THUNDERSTORM ACTIVITY HAD MOVED EAST OF THESE COUNTIES NO LONGER POSING A THREAT FOR FLASH FLOODING. HOWEVER... THUNDERSTORMS MAY REFORM IN THESE AREAS LATER THIS EVENING AS THE ATMOSPHERE REMAINS VERY MOIST AND UNSTABLE. A FLANSH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT MDT FOR ALL OF NORTHEAST COLORADO. BAKER
Special weather statement, Jul 29, 7:19 PM MDT, 41 minutes before
COZ035-038-300145- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 719 PM MDT TUE JUL 29 1997 ...THUNDERSTORM MOVING TOWARD FORT COLLINS... AT 715 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS ABOUT 15 MILES SOUTHWEST OF FORT COLLINS. THESE STORMS WERE MOVING NORTHEAST AT 15 MPH AND WILL BE MOVING INTO THE HORSETOOTH RESERVOIR AND FORT COLLINS AREA BETWEEN 800 AND 815 PM. AT THIS TIME...THE STORMS WERE PRODUCING RAINFALL AMOUNTS LESS THAN 1/2 INCH. THIS WOULD CAUSE NO ADDITIONAL FLOODING PROBLEMS. HOWEVER...THE STORMS COULD STILL INTENSIFY AS THEY MOVE OFF THE FOOTHILLS. PERSONS IN AND NEAR FORT COLLINS SHOULD BE ON THE LOOKOUT FOR THE POTENTIAL OF ADDITIONAL HEAVY RAINFALL. IF HEAVY RAIN DOES DEVELOP...FLOODING OF CREEKS AND STREAMS... STREETS...DITCHES...AND OTHER LOW LYING AREAS CAN BE EXPECTED. STAY TUNED TO NOAA WEATHER RADIO OR YOUR LOCAL NEWS MEDIA FOR THE LATEST UPDATES AND POSSIBLE WARNINGS. BARJENBRUCH
Special weather statement, Jul 29, 7:20 PM MDT, 40 minutes before
COZ035-038-300145- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 719 PM MDT TUE JUL 29 1997 ...THUNDERSTORM MOVING TOWARD FORT COLLINS... AT 715 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS ABOUT 15 MILES SOUTHWEST OF FORT COLLINS. THESE STORMS WERE MOVING NORTHEAST AT 15 MPH AND WILL BE MOVING INTO THE HORSETOOTH RESERVOIR AND FORT COLLINS AREA BETWEEN 800 AND 815 PM. AT THIS TIME...THE STORMS WERE PRODUCING RAINFALL AMOUNTS LESS THAN 1/2 INCH. THIS WOULD CAUSE NO ADDITIONAL FLOODING PROBLEMS. HOWEVER...THE STORMS COULD STILL INTENSIFY AS THEY MOVE OFF THE FOOTHILLS. PERSONS IN AND NEAR FORT COLLINS SHOULD BE ON THE LOOKOUT FOR THE POTENTIAL OF ADDITIONAL HEAVY RAINFALL. IF HEAVY RAIN DOES DEVELOP...FLOODING OF CREEKS AND STREAMS... STREETS...DITCHES...AND OTHER LOW LYING AREAS CAN BE EXPECTED. STAY TUNED TO NOAA WEATHER RADIO OR YOUR LOCAL NEWS MEDIA FOR THE LATEST UPDATES AND POSSIBLE WARNINGS. BARJENBRUCH
Special weather statement, Jul 29, 7:40 PM MDT, 20 minutes before
COZ046-047-049-300240- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 740 PM MDT TUE JUL 29 1997 ...THUNDERSTORMS CAPABLE OF VERY HEAVY RAINFALL MOVING INTO SOUTHWEST WASHINGTON AND NORTHERN AND CENTRAL LINCOLN COUNTIES... A LINE OF THUNDERSTORMS WILL DRIFT VERY SLOWLY ACROSS SOUTHWESTERN WASHINGTON AND NORTHERN AND CENTRAL LINCOLN COUNTIES PRODUCING VERY HEAVY RAIN AND SMALL HAIL. AT 735 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE HEAVIEST RAINFALL OVER OPEN RANGELAND ALONG INTERSTATE 70...10 MILES NORTH OF LIMON. THESE STORMS WERE MOVING EAST-NORTHEAST AT 15 MILES PER HOUR. A SECOND AREA OF THUNDERSTORMS FROMING OVER CENTRAL LINCOLN COUNTY JUST SOUTH OF HUGO WERE DEVELOPING RAPIDLY AND WERE MOVING NORTHWEST AT 10 MILES PER HOUR. THESE STORMS ARE EXPECTED TO COLLIDE WITH STORMS OVER NORTHERN LINCOLN COUNTY IN THE NEXT 30 MINUTES. TORRENTIAL RAIN MAY DEVELOP WHEN THIS OCCURS LIKELY PROMPTING ISSUANCE OF A FLASH FLOOD WARNING. PERSONS IN OR NEAR ANTON...ARRIBA...BOYERO...ELBA...GENOA...HUGO... LAST CHANCE...LIMON...LINDON...THURMAN...WOODLIN SCHOOL AND WOODROW SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND BE PREPARED MOVE TO HIGH GROUND IF FLOODING OCCURS. HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS 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. BAKER
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 6:24 PM MDT | Flash Flood Warning | BOU | Elbert | 96 min |
| Jul 29, 7:03 PM MDT | Flash Flood Warning | BOU | Logan, Weld | 72 min |
| Jul 29, 7:59 PM MDT | Flash Flood Warning | BOU | Elbert, Lincoln | 2 hr |
| Jul 29, 8:15 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 29, 8:20 PM MDT | Flash Flood Warning | BOU | Morgan | 55 min |
| Jul 29, 9:20 PM MDT | Flash Flood Warning | BOU | Morgan | 40 min |
| Jul 29, 9:40 PM MDT | Flash Flood Warning | BOU | Logan, Weld | 80 min |
| Jul 29, 9:55 PM MDT | Flash Flood Warning | BOU | Elbert, Lincoln | 2 hr |
| Jul 29, 10:10 PM MDT | Flash Flood Warning | BOU | Morgan | 50 min |
| Jul 29, 10:50 PM MDT | Flash Flood Warning | BOU | Logan, Morgan, Washington, Weld | 2 hr |
| Jul 29, 11:26 PM MDT | Flash Flood Warning | BOU | Elbert, Lincoln | 2 hr |
| Jul 30, 2:25 PM MDT | Flash Flood Warning | BOU | Larimer | 110 min |
| Jul 30, 3:25 PM MDT | Flash Flood Warning | BOU | Boulder, Clear Creek, Gilpin, Jefferson | 2 hr |
| Jul 30, 4:05 PM MDT | Flash Flood Warning | BOU | Boulder, Jefferson | 115 min |
| Jul 30, 4:05 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Jefferson | 115 min |
| Jul 30, 4:30 PM MDT | Flash Flood Warning | BOU | Logan | 14 hr |
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.