Alert archive / Colorado / Flash Flood Warnings in 1998
Flash Flood Warning 5, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 24, 1998, 3:07 PM MDT for Morgan County, Colorado. It was in force for 113 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
- Jul 24, 1998, 3:07 PM MDT (21:07 UTC)
- Expired
- Jul 24, 1998, 5:00 PM MDT
- In force
- 113 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Morgan County, CO
The radar
The Denver radar (KFTG), 72 km from the middle of the area, began a volume at 21:01 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 12:00Z, 9.1 hours before the alert went out and 63 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
- 340 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 751 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- -13 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 242110
FFWDEN
COC087-242300-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
307 PM MDT FRI JUL 24 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL MORGAN COUNTY IN NORTHEAST COLORADO
* UNTIL 500 PM MDT
* AT 301 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS PRODUCING VERY HEAVY RAIN OVER CENTRAL MORGAN
COUNTY...OR ABOUT 5 MILES SOUTH AND SOUTHWEST OF FORT MORGAN.
THESE THUNDERSTORMS WERE NEARLY STATIONARY. RADAR ESTIMATES UP TO
5 INCHES OF RAIN HAS OCCURRED IN THIS REGION DURING THE PAST FEW
HOURS.
RESIDENTS OVER CENTRAL MORGAN COUNTY THAT LIVE SOUTH AND SOUTHWEST
OF FORT MORGAN AND ALONG BADGER CREEK SHOULD BE PREPARED FOR
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES AND
ARROYOS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR OTHER LOW SPOTS IF WATER COVERS
THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.
LAT...LON 4013 10394 4013 10373 4022 10374 4021 10393
KLEYLAWhat 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, 12:02 PM MDT, 3 hours 5 minutes before
COZ030-032>050-250600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1200 AM MDT FRI JUL 24 1998 THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES ADAMS ARAPAHOE BOULDER CLEAR CREEK DENVER DOUGLAS ELBERT GILPIN GRAND JACKSON JEFFERSON LARIMER LINCOLN LOGAN MORGAN PARK PHILLIPS SEDGWICK SUMMIT WASHINGTON WELD SYNOPSIS: ABUNDANT MONSOONAL MOISTURE AT LOWER AND MID LEVELS REMAINS IN PLACE OVER NORTHEAST COLORADO TODAY. CLOUD COVER AND FOG HAVE HELD BACK SURFACE TEMPERATURES THROUGH LATE THIS MORNING...BUT AS INCREASING SUNBREAKS DURING THE AFTERNOON WILL ALLOW READINGS TO BEGIN CLIMBING. AS TEMPERATURES REACH THE UPPER 70S AND NEAR 80... THE ATMOSPHERE WILL BECOME UNSTABLE WITH RAINSHOWERS AND THUNDERSTORMS DEVELOPING. VERY WEAK WINDS ABOVE THE SURFACE WILL CAUSE DEVELOPING THUNDERSTORMS TO MOVE VERY SLOWLY. THE HIGH LEVELS OF MOISTURE IN THE ATMOSPHERE WILL CAUSE SHOWERS TO PRODUCE LOCALLY HEAVY RAINFALL. THE THREAT OF HAIL FROM THUNDERSTORMS IS MINIMAL... BUT HEAVY RAINS COULD CAUSE LOCALIZED FLOODING PROBLEMS THROUGH THE LATE AFTERNOON AND EVENING. LATE MORNING SATELLITE PICTURES INDICATE THAT AREAS SOUTH OF I-76 HAVE BEEN RECEIVING MORE SUN THAN AREAS CLOSER TO THE FOOTHILLS. THESE AREAS WILL HAVE THE WARMEST TEMPERATURES BY MID-AFTERNOON... AND SHOULD BE WHERE THE STRONGEST STORMS DEVELOP. MORGAN... WASHINGTON...EASTERN ADAMS AND EASTERN ARAPAHOE COUNTIES WILL HAVE THE HIGHEST THREAT OF RECEIVING HEAVY RAINS. RAINFALL AMOUNTS OF 2 TO 3 INCHES IN ONE OR TWO HOURS WILL BE POSSIBLE. THE HEAVY RAINS FALLING ON ALREADY WET GROUND FROM PREVIOUS RAINFALL MAY LEAD TO FLOODING PROBLEMS. AREAS ALONG THE I-25 CORRIDOR WILL SEE SHOWERS AND THUNDERSTORMS MOVE SLOWLY OFF THE FOOTHILLS. SOIL MOISTURE LEVELS ARE LOWER NEAR THE FOOTHILLS...SO A SLIGHTLY LOWER THREAT OF FLOODING PROBLEMS EXISTS THERE. SPOTTER ACTIVATION IS NOT EXPECTED THIS AFTERNOON...BUT SKYWARN SPOTTERS ARE ASKED TO RELAY ANY HEAVY RAIN OR FLOODING REPORTS TO THE NATIONAL WEATHER SERVICE IN DENVER. DANKERS t
Special weather statement, Jul 24, 1:49 PM MDT, 1 hour 18 minutes before
COZ033-035-242030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 149 PM MDT FRI JUL 24 1998 ...STRONG THUNDERSTORM DEVELOPING IN CENTRAL LARIMER COUNTY EARLY THIS AFTERNOON... AT 145 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 3 MILES NORTH OF RUSTIC...OR ABOUT 28 MILES NORTHWEST OF FORT COLLINS...MOVING SOUTHEAST AT 5 TO 10 MILES PER HOUR. THIS STORM WAS PRODUCING VERY HEAVY RAIN UP TO 2 INCHES PER HOUR...SMALL HAIL...GUSTY WINDS AND DANGEROUS LIGHTNING. PERSONS IN OR NEAR RED FEATHER LAKES AND RUSTIC SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. 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. KL,EYLA
Special weather statement, Jul 24, 1:49 PM MDT, 1 hour 18 minutes before
COZ033-035-242030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 149 PM MDT FRI JUL 24 1998 ...STRONG THUNDERSTORM DEVELOPING IN CENTRAL LARIMER COUNTY EARLY THIS AFTERNOON... AT 145 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 3 MILES NORTH OF RUSTIC...OR ABOUT 28 MILES NORTHWEST OF FORT COLLINS...MOVING SOUTHEAST AT 5 TO 10 MILES PER HOUR. THIS STORM WAS PRODUCING VERY HEAVY RAIN UP TO 2 INCHES PER HOUR...SMALL HAIL...GUSTY WINDS AND DANGEROUS LIGHTNING. PERSONS IN OR NEAR RED FEATHER LAKES AND RUSTIC SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. 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. KL,EYLA
Special weather statement, Jul 24, 3:02 PM MDT, 5 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 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
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 3:52 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Elbert | 28 min |
| Jul 24, 3:54 PM MDT | Tornado Warning | BOU | Adams, Arapahoe | 36 min |
| Jul 24, 5:10 PM MDT | Flash Flood Warning | BOU | Weld | 95 min |
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; radar from the NEXRAD Level II archive.