Alert archive / Colorado / Flash Flood Warnings in 1998
Flash Flood Warning 7, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 24, 1998, 8:28 PM MDT for Adams County, Arapahoe County, Colorado. It was in force for 3 hr. 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
- Jul 24, 1998, 8:28 PM MDT (02:28 UTC)
- Expired
- Jul 24, 1998, 11:30 PM MDT
- In force
- 3 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Adams County, CO, Arapahoe County, CO
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 2.5 hours before the alert went out and 65 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
- 166 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 1389 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 58 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 250229
FFWDEN
COC001-005-250530-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
828 PM MDT FRI JUL 24 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EXTREME SOUTHEASTERN ADAMS COUNTY IN NORTHEAST COLORADO
EASTERN ARAPAHOE COUNTY IN NORTHEAST COLORADO
* UNTIL 1130 PM MDT
* AT 825 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
EXTRMELY HEAVY RAIN FROM DEER TRAIL TO SHAMROCK...OR FROM ABOUT
28 MILES NORTHWEST OF LIMON TO 30 MILES SOUTHWEST OF AKRON.
RADAR INDICATES BETWEEN 3 AND 4 INCHES OF RAIN HAS FALLEN IN THIS
AREA DURING THE LAST TWO HOURS. ANOTHER INCH OR TWO OF RAIN MAY
FALL BEFORE DIMINISHING BY 10 PM.
TOWNS IN THE WARNING INCLUDE...
DEER TRAIL
CREEKS AND STREAMS IN THE WARNING INCLUDE...
MIDDLE BIJOU CREEK...EAST BIJOU CREEK...AND MUDDY CREEK.
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF
CREEKS AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES AND
ARROYOS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT
QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY
IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
LAT...LON 3978 10382 3957 10397 3957 10415 3985 10403
BARJENBRUCHWhat 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 24, 3:02 PM MDT, 5 hours 26 minutes before
COZ036-242130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 302 PM MDT FRI JUL 24 1998 ...THUNDERSTORMS DEVELOPING IN SOUTHERN JEFFERSON COUNTY NEAR BUFFALO CREEK... AT 257 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS DEVELOPING RAPIDLY NEAR BUFFALO CREEK. THESE STORMS MAY PRODUCE UP TO 1 1/2 INCHES OF RAIN IN LESS THAN AN HOUR ALONG WITH DANGEROUS LIGHTNING. PERSONS IN THE TOWN OF BUFFALO CREEK AND ALONG THE CREEK ITSELF SHOULD BE PREPARED FOR HEAVY RAINS WHICH MAY FLOOD LOW LYING AREAS. 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. KLEYLA
Special weather statement, Jul 24, 3:02 PM MDT, 5 hours 26 minutes before
COZ036-242130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 302 PM MDT FRI JUL 24 1998 ...THUNDERSTORMS DEVELOPING IN SOUTHERN JEFFERSON COUNTY NEAR BUFFALO CREEK... AT 257 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS DEVELOPING RAPIDLY NEAR BUFFALO CREEK. THESE STORMS MAY PRODUCE UP TO 1 1/2 INCHES OF RAIN IN LESS THAN AN HOUR ALONG WITH DANGEROUS LIGHTNING. PERSONS IN THE TOWN OF BUFFALO CREEK AND ALONG THE CREEK ITSELF SHOULD BE PREPARED FOR HEAVY RAINS WHICH MAY FLOOD LOW LYING AREAS. 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. KLEYLA
Special weather statement, Jul 24, 6:37 PM MDT, 1 hour 51 minutes before
COZ039>040-250200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 637 PM MDT FRI JUL 24 1998 ...THUNDERSTORMS WITH VERY HEAVY RAIN WILL QUICKLY DEVELOP IN THE DENVER METRO AREA... THE ATMOSPHERE IS PRIMED FOR THE DEVELOPMENT OF HEAVY RAIN IN THE DENVER AND BOULDER METRO AREAS THIS EVENING. AT 630 PM MDT... NATIONAL WEATHER SERVICE RADAR WAS SHOWING THE FIRST SIGNS OF THUNDERSTORM DEVELOPMENT OVER THE NORTHERN AND WESTERN PORTIONS OF THE METRO AREA. THESE STORMS ARE EXPECTED TO QUICKLY DEVELOP AND INCREASE IN BOTH SIZE AND INTENSITY DURING THE NEXT HOUR. EXTREMELY HEAVY RAINFALL OF 1.5 TO 2.5 INCHES PER HOUR CAN BE EXPECTED WITH THE STRONGER STORMS. THIS MAY CAUSE FLOODING OF ROADS...INTERSECTIONS...AND UNDERPASSES...AS WELL AS SMALL CREEKS AND STREAMS IN THE METROPOLITAN AREA. STAY TUNED TO THE NATIONAL WEATHER SERVICE OR YOUR LOCAL NEWS MEDIA FOR THE LATEST UPDATES AND/OR WARNINGS. BARJENBRUCH
Special weather statement, Jul 24, 6:37 PM MDT, 1 hour 51 minutes before
COZ039>040-250200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 637 PM MDT FRI JUL 24 1998 ...THUNDERSTORMS WITH VERY HEAVY RAIN WILL QUICKLY DEVELOP IN THE DENVER METRO AREA... THE ATMOSPHERE IS PRIMED FOR THE DEVELOPMENT OF HEAVY RAIN IN THE DENVER AND BOULDER METRO AREAS THIS EVENING. AT 630 PM MDT... NATIONAL WEATHER SERVICE RADAR WAS SHOWING THE FIRST SIGNS OF THUNDERSTORM DEVELOPMENT OVER THE NORTHERN AND WESTERN PORTIONS OF THE METRO AREA. THESE STORMS ARE EXPECTED TO QUICKLY DEVELOP AND INCREASE IN BOTH SIZE AND INTENSITY DURING THE NEXT HOUR. EXTREMELY HEAVY RAINFALL OF 1.5 TO 2.5 INCHES PER HOUR CAN BE EXPECTED WITH THE STRONGER STORMS. THIS MAY CAUSE FLOODING OF ROADS...INTERSECTIONS...AND UNDERPASSES...AS WELL AS SMALL CREEKS AND STREAMS IN THE METROPOLITAN AREA. STAY TUNED TO THE NATIONAL WEATHER SERVICE OR YOUR LOCAL NEWS MEDIA FOR THE LATEST UPDATES AND/OR WARNINGS. BARJENBRUCH
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 2:44 PM MDT | Tornado Warning | BOU | Larimer, Weld | 26 min |
| Jul 25, 4:15 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 30 min |
| Jul 25, 4:29 PM MDT | Flash Flood Warning | BOU | Logan | 3 hr |
| Jul 25, 4:50 PM MDT | Flash Flood Warning | BOU | Clear Creek | 115 min |
| Jul 25, 5:03 PM MDT | Tornado Warning | BOU | Adams, Denver | 27 min |
| Jul 25, 5:07 PM MDT | Flash Flood Warning | BOU | Morgan | 3 hr |
| Jul 25, 5:35 PM MDT | Flash Flood Warning | BOU | Washington | 2 hr |
| Jul 25, 5:41 PM MDT | Flash Flood Warning | BOU | Washington | 2 hr |
Nearby
Flash Flood Warnings in Colorado, 1998Every flash flood warning in 1998
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.