Alert archive / Colorado / Flash Flood Warnings in 1998
Flash Flood Warning 24, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 31, 1998, 6:20 PM MDT for Jefferson County, Colorado. It was in force for 70 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 31, 1998, 6:20 PM MDT (00:20 UTC)
- Expired
- Jul 31, 1998, 7:30 PM MDT
- In force
- 70 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
County Jefferson County, CO
The radar
The Denver radar (KFTG), 64 km from the middle of the area, began a volume at 00:19 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, 0.3 hours before the alert went out and 176 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
- 1053 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 1260 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 46 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 010028
FFWDEN
COC059-010130-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
620 PM MDT FRI JUL 31 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS REISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHERN JEFFERSON COUNTY IN NORTHEAST COLORADO
* UNTIL 730 PM MDT
* AT 620 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THAT RAIN HAD DIMINISHED OVER THE BUFFALO CREEK AREA. HOWEVER
MAJOR FLOODING WAS STILL OCCURRING ALONG THE NORTH FORK OF THE
SOUTH PLATTE RIVER FROM BUFFLAO CREEK TO FOXTON TO THE MOUTH OF
THE SOUTH PLATTE RIVER.
LOCATIONS IN THE WARNING INCLUDE...FOXTON AND FERNDALE
THIS IS A DEADLY SITUATION AND RESIDENTS ALONG THE NORTH FORK OF THE
SOUTH PLATTE RIVER FROM BUFFALO CREEK TO FOXTON EXTENDING TO THE
MOUTH OF THE SOUTH PLATTE RIVER SHOULD SEE HIGHER GROUND NOW!!!
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...JLON 3940 10529 3936 10525 3948 10511 3952 10516
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 31, 4:29 PM MDT, 1 hour 51 minutes before
COZ036-312300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 429 PM MDT FRI JUL 31 1998 ...THUNDERSTORMS DEVELOPING RAPIDLY NEAR BUFFALO CREEK IN SOUTHERN JEFFERSON COUNTY... AT 423 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED RAPIDLY DEVELOPING THUNDERSTORMS 3 MILES SOUTHWEST OF BUFFALO CREEK. THESE STORMS MAY PRODUCE UP TO 1 1/2 INCHES OF RAIN IN 45 MINUTES AS THEY PASS OVER THE BUFFALO CREEK AREA. THOSE LIVING IN AND NEAR BUFFALO CREEK SHOULD BE PREPARED FOR RAPIDLY RISING WATER ALONG BUFFALO CREEK AS THE STORMS MOVE ACROSS THE REGION IN THE NEXT 45 MINUTES. KLEYLA
Special weather statement, Jul 31, 4:29 PM MDT, 1 hour 51 minutes before
COZ036-312300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 429 PM MDT FRI JUL 31 1998 ...THUNDERSTORMS DEVELOPING RAPIDLY NEAR BUFFALO CREEK IN SOUTHERN JEFFERSON COUNTY... AT 423 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED RAPIDLY DEVELOPING THUNDERSTORMS 3 MILES SOUTHWEST OF BUFFALO CREEK. THESE STORMS MAY PRODUCE UP TO 1 1/2 INCHES OF RAIN IN 45 MINUTES AS THEY PASS OVER THE BUFFALO CREEK AREA. THOSE LIVING IN AND NEAR BUFFALO CREEK SHOULD BE PREPARED FOR RAPIDLY RISING WATER ALONG BUFFALO CREEK AS THE STORMS MOVE ACROSS THE REGION IN THE NEXT 45 MINUTES. KLEYLA
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.