Alert archive / Colorado / Flash Flood Warnings in 1998
Flash Flood Warning 14, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Jul 30, 1998, 3:00 PM MDT for Arapahoe County, Douglas 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 30, 1998, 3:00 PM MDT (21:00 UTC)
- Expired
- Jul 30, 1998, 6:00 PM MDT
- In force
- 3 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Arapahoe County, CO, Douglas County, CO
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 9.0 hours before the alert went out and 133 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
- 61 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 804 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 1 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 302117 COR
FFWDEN
COC005-035-310000-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTION
NATIONAL WEATHER SERVICE DENVER CO
300 PM MDT THU JUL 30 1998
...CORRECTED TO ADD CASTLE ROCK AND SILVER HEIGHTS IN THE CITIES
LIST...
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHWESTERN ARAPAHOE COUNTY IN NORTHEAST COLORADO
NORTHEASTERN DOUGLAS COUNTY IN NORTHEAST COLORADO
* UNTIL 600 PM MDT
* AT 258 PM MDT...THE PUBLIC REPORTED 1.81 INCHES OF RAIN IN PARKER
IN ONLY 15 MINUTES. THE STORM WAS MOVING EAST AT 15 MILES PER HOUR.
HIGH WATERS FROM THIS STORM WILL MOVE TOWARDS CHERRY CREEK RESERVOIR.
OTHER STORMS CONTINUE TO REDEVELOP IN DOUGLAS COUNTY AND FLASH
FLOODING IS LIKELY.
LOCATIONS IN THE WARNING INCLUDE...CASTLE ROCK...ARAPAHOE PARK...
PARKER...THE PINERY...AND SILVER HEIGHTS
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.
LAT...LON 3961 10488 3937 10483 3945 10468 3956 10465
3957 10453 3967 10466
COOPERWhat 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 30, 9:22 AM MDT, 5 hours 38 minutes before
COZ043-301600- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 922 AM MDT THU JUL 30 1998 ...FUNNEL CLOUDS REPORTED SOUTH OF GREELEY... AT 919 AM MDT...THE PUBLIC REPORTED A FUNNEL CLOUD ABOUT 5 MILES SOUTH OF GREELEY. THERE WERE ONLY SOME LIGHT RAIN SHOWERS IN THE AREA...BUT PEOPLE IN THE AREAS BETWEEN LASALLE AND PLATTEVILLE SHOULD REMAIN ALERT TO WEATHER CONDITIONS. IF A FUNNEL CLOUD IS APPROACHING YOUR AREA...TAKE SHELTERN IN A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. BARJENBRUCH
Special weather statement, Jul 30, 9:22 AM MDT, 5 hours 38 minutes before
COZ043-301600- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 922 AM MDT THU JUL 30 1998 ...FUNNEL CLOUDS REPORTED SOUTH OF GREELEY... AT 919 AM MDT...THE PUBLIC REPORTED A FUNNEL CLOUD ABOUT 5 MILES SOUTH OF GREELEY. THERE WERE ONLY SOME LIGHT RAIN SHOWERS IN THE AREA...BUT PEOPLE IN THE AREAS BETWEEN LASALLE AND PLATTEVILLE SHOULD REMAIN ALERT TO WEATHER CONDITIONS. IF A FUNNEL CLOUD IS APPROACHING YOUR AREA...TAKE SHELTERN IN A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. BARJENBRUCH
Special weather statement, Jul 30, 11:10 AM MDT, 3 hours 50 minutes before
COZ030-032>050-310600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1110 AM MDT THU JUL 30 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 MOISTURE WILL REMAIN IN PLACE ACROSS EASTERN COLORADO THROUGH THIS AFTERNOON AND EVENING. THE BEST INSTABILITY WILL BE FOUND IN AND NEAR THE FOOTHILLS WHERE A FEW PEAKS OF SUNSHINE WILL OCCUR. ON THE NORTHEAST PLAINS...THE AIRMASS IS QUITE STABLE AS LOW LEVEL COOL AIR HAS SPREAD IN BEHIND A SURFACE FRONT. AS DAYTIME HEATING REACTS WITH THE MOISTURE IN AND NEAR THE FOOTHILLS...THUNDERSTORMS WILL BE DEVELOPING BY 1 PM. AN UPPER LEVEL DISTURBANCE MOVING TOWARD WESTERN COLORADO NOW WILL ALSO BE APPROACHING BY LATE THIS AFTERNOON TO HELP SPARK THE DEVELOPMENT OF STORMS. WITH ABUNDANT MOISTURE IN PLACE...LOCALLY HEAVY RAINFALL WILL OCCUR IN AND NEAR THE FOOTHILLS. THIS WOULD INCLUDE THE FRONT RANGE FROM CASTLE ROCK AND DENVER NORTHWARD THROUGH FORT COLLINS. SEVERE STORMS AND LARGE HAIL WILL NOT BE A THREAT TODAY GIVEN THE CLOUD COVER AND LIMITED INSTABILITY. HOWEVER...BE ON THE LOOKOUT FOR HEAVY RAINFALL. RAINFALL RATES WITH THE STRONGER STORMS MAY EXCEED 2 INCHES PER HOUR. A FLASH FLOOD WATCH MAY BE REQUIRED FOR THE FOOTHILLS AND FRONT RANGE CITIES LATER THIS AFTERNOON. SPOTTER ACTIVATION FOR SEVERE WEATHER WILL NOT BE REQUIRED TODAY. HOWEVER...ANY REPORTS OF HEAVY RAINFAVLL WOULD BE GREATLY APPRECIATED. BARJENBRUCH
Special weather statement, Jul 30, 11:10 AM MDT, 3 hours 50 minutes before
COZ030-032>050-310600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1110 AM MDT THU JUL 30 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 MOISTURE WILL REMAIN IN PLACE ACROSS EASTERN COLORADO THROUGH THIS AFTERNOON AND EVENING. THE BEST INSTABILITY WILL BE FOUND IN AND NEAR THE FOOTHILLS WHERE A FEW PEAKS OF SUNSHINE WILL OCCUR. ON THE NORTHEAST PLAINS...THE AIRMASS IS QUITE STABLE AS LOW LEVEL COOL AIR HAS SPREAD IN BEHIND A SURFACE FRONT. AS DAYTIME HEATING REACTS WITH THE MOISTURE IN AND NEAR THE FOOTHILLS...THUNDERSTORMS WILL BE DEVELOPING BY 1 PM. AN UPPER LEVEL DISTURBANCE MOVING TOWARD WESTERN COLORADO NOW WILL ALSO BE APPROACHING BY LATE THIS AFTERNOON TO HELP SPARK THE DEVELOPMENT OF STORMS. WITH ABUNDANT MOISTURE IN PLACE...LOCALLY HEAVY RAINFALL WILL OCCUR IN AND NEAR THE FOOTHILLS. THIS WOULD INCLUDE THE FRONT RANGE FROM CASTLE ROCK AND DENVER NORTHWARD THROUGH FORT COLLINS. SEVERE STORMS AND LARGE HAIL WILL NOT BE A THREAT TODAY GIVEN THE CLOUD COVER AND LIMITED INSTABILITY. HOWEVER...BE ON THE LOOKOUT FOR HEAVY RAINFALL. RAINFALL RATES WITH THE STRONGER STORMS MAY EXCEED 2 INCHES PER HOUR. A FLASH FLOOD WATCH MAY BE REQUIRED FOR THE FOOTHILLS AND FRONT RANGE CITIES LATER THIS AFTERNOON. SPOTTER ACTIVATION FOR SEVERE WEATHER WILL NOT BE REQUIRED TODAY. HOWEVER...ANY REPORTS OF HEAVY RAINFAVLL WOULD BE GREATLY APPRECIATED. BARJENBRUCH
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 6:01 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Elbert | 29 min |
| Jul 29, 6:32 PM MDT | Severe Thunderstorm Warning | BOU | Elbert, Lincoln | 43 min |
| Jul 29, 7:13 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 32 min |
| Jul 29, 7:39 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 36 min |
| Jul 30, 1:41 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Jefferson, Park | 34 min |
| Jul 30, 4:22 PM MDT | Flash Flood Warning | BOU | Elbert, Lincoln | 2 hr |
| Jul 30, 4:24 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 51 min |
| Jul 30, 5:00 PM MDT | Flash Flood Warning | BOU | Park | 2 hr |
| Jul 30, 5:14 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 46 min |
| Jul 30, 5:25 PM MDT | Flash Flood Warning | BOU | Elbert, Lincoln | 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.