Alert archive / Colorado / Flash Flood Warnings in 1997
Flash Flood Warning 18, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 29, 1997, 7:03 PM MDT for Logan County, Weld County, Colorado. It was in force for 72 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, 7:03 PM MDT (01:03 UTC)
- Expired
- Jul 29, 1997, 8:15 PM MDT
- In force
- 72 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 01:03 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, 1.1 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 300105 COR
FFWDEN
COC123-075-300215-
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
703 PM MDT TUE JUL 29 1997
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A FLASH FLOOD
WARNING EFFECTIVE UNTIL 815 PM MDT FOR PEOPLE IN THE FOLLOWING
NORTHEAST COLORADO COUNTIES
EXTREME NORTHEASTERN WELD AND NORTHWESTERN LOGAN
INCLUDING THE FOLLOWING LOCATIONS
WESTPLAINS AND THE PAWNEE NATIONAL GRASSLANDS
AT 655 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
TORRENTIAL RAINFALL OVER THE PAWNEE NATIONAL GRASSLANDS IN EXTREME
NORTHEAST WELD COUNTY. DOPPLER RADAR HAS ESTIMATES OF 2 TO 2 1/2
INCHES OF RAIN IN THIS AREA IN THE PAST HOUR.
ALTHOUGH THE HEAVY RAIN WAS FALLING IN UNINHABITED GRASSLAND AREAS
SEVERAL SMALL STREAMS AND CREEKS ORIGINATING IN THE AREA 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.
ADDITIONAL RAINFALL AMOUNTS RANGING FROM 1 TO 2 INCHES ARE POSSIBLE
IN THE WARNING AREA BY 8 PM MDT.
EXCESSIVE RUNOFF FROM THIS 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.
BAKERWhat 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, 6:15 PM MDT, 48 minutes before
COZ046-049-300145- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 615 PM MDT TUE JUL 29 1997 ...WEATHER CONDITIONS RIGHT FOR HEAVY RAIN PRODUCING THUNDERSTORMS IN NORTHERN LINCOLN AND WASHINGTON COUNTIES... A LINE OF THUNDERSTORMS MOVING EAST INTO VERY MOIST AND UNSTABLE AIR LYING ACROSS NORTHERN LINCOLN AND WASHINGTON COUNTINES IN NORTHEAST COLORADO WILL LIKELY FUEL HEAVY RAIN PRODUCING THUNDERSTORMS BETWEEN 620 AND 745 PM MDT. NATIONAL WEATHER SERVICE DOPPLER RADAR AS OF 600 PM WAS ALREADY INDICATED NEW THUNDERSTORM DEVELOPMENT BETWEEN AKRON AND ANTON. THE POTENTIAL EXISTS FOR RAINFALL RATES OF 1 TO 3 INCHES PER HOUR FROM THESE THUNDERSTORMS MOVE EAST ACROSS WASHINGTON AND NORTHERN LINCOLN COUNTIES AT 10 TO 15 MILES PER HOUR. HEAVY RAIN FALLING ON ALREADY SATURATED GROUND MAY CAUSE FLOODING OF DRY CREEK BEDS...FIELDS...DITCHES AND LOW LANDS. LOW LYING ROADS MAY ALSO BECOME SUBMERGED OR WASHED OUT BY FLOOD WATERS. BE PREPARED TO MOVE QUICKLY TO HIGH GROUND IF HIGH WATERS ARE OBSERVED. NORTHEAST COLORADO REMAINS UNDER A FLASH FLOOD WATCH UNTIL MIDNIGHT MDT TONIGHT. BAKER
Special weather statement, Jul 29, 6:15 PM MDT, 48 minutes before
COZ046-049-300145- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 615 PM MDT TUE JUL 29 1997 ...WEATHER CONDITIONS RIGHT FOR HEAVY RAIN PRODUCING THUNDERSTORMS IN NORTHERN LINCOLN AND WASHINGTON COUNTIES... A LINE OF THUNDERSTORMS MOVING EAST INTO VERY MOIST AND UNSTABLE AIR LYING ACROSS NORTHERN LINCOLN AND WASHINGTON COUNTIES IN NORTHEAST COLORADO WILL LIKELY FUEL HEAVY RAIN PRODUCING THUNDERSTORMS BETWEEN 620 AND 745 PM MDT. NATIONAL WEATHER SERVICE DOPPLER RADAR AS OF 600 PM WAS ALREADY INDICATED NEW THUNDERSTORM DEVELOPMENT BETWEEN AKRON AND ANTON. THE POTENTIAL EXISTS FOR RAINFALL RATES OF 1 TO 3 INCHES PER HOUR FROM THESE THUNDERSTORMS MOVE EAST ACROSS WASHINGTON AND NORTHERN LINCOLN COUNTIES AT 10 TO 15 MILES PER HOUR. HEAVY RAIN FALLING ON ALREADY SATURATED GROUND MAY CAUSE FLOODING OF DRY CREEK BEDS...FIELDS...DITCHES AND LOW LANDS. LOW LYING ROADS MAY ALSO BECOME SUBMERGED OR WASHED OUT BY FLOOD WATERS. BE PREPARED TO MOVE QUICKLY TO HIGH GROUND IF HIGH WATERS ARE OBSERVED. NORTHEAST COLORADO REMAINS UNDER A FLASH FLOOD WATCH UNTIL MIDNIGHT MDT TONIGHT. BAKER
Special weather statement, Jul 29, 6:38 PM MDT, 25 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 MIDNIGHT MDT FOR ALL OF NORTHEAST COLORADO. BAKER
Special weather statement, Jul 29, 6:38 PM MDT, 25 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, 24 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, 23 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
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, 7:59 PM MDT | Flash Flood Warning | BOU | Elbert, Lincoln | 2 hr |
| Jul 29, 8:00 PM MDT | Flash Flood Warning | BOU | Logan, Weld | 90 min |
| 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.