Alert archive / Colorado / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 9, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 10, 1998, 5:14 PM MDT for Larimer County, Weld County, Colorado. It was in force for 46 min. 2 reports came from 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, with what was reported inside it.
The facts
- Issued
- May 10, 1998, 5:14 PM MDT (23:14 UTC)
- Expired
- May 10, 1998, 6:00 PM MDT
- In force
- 46 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Larimer County, CO, Weld County, CO
The radar
The Cheyenne radar (KCYS), 64 km from the middle of the area, began a volume at 23:05 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 10, 5:15 PM MDT | Hail 0.75 | Ft Collins, CO | |
| May 10, 5:25 PM MDT | Hail 1 | Ft Collins, CO |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 11.2 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
- 12 J/kg
- Mixed-layer CIN
- -208 J/kg
- Mixed-layer LCL
- 889 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 55 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
225
WUUS1 KDEN 102316 RRA
SVRDEN
COC069-123-110000-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
514 PM MDT SUN MAY 10 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
EAST CENTRAL LARIMER COUNTY IN NORTH CENTRAL COLORADO
WEST CENTRAL WELD COUNTY IN NORTHEAST COLORADO
* UNTIL 600 PM MDT
* AT 511 PM MDT THE PUBLIC REPORTED A SEVERE THUNDERSTORM 3 MILES
SOUTHWEST OF FORT COLLINS...MOVING NORTHEAST AT 15 MILES PER HOUR.
* LOCATIONS IN THE WARNING INCLUDE FORT COLLINS...BELLVUE...
HARMONY...SEVERANCE...TEDS PLACE...TIMNATH AND WELLINGTON
HAIL UP TO 1 INCHE IN DIAMETER HAS BEEN REPORTED WITH THIS STORM.
IF YOU ARE IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND
MOVE TO A SUBSTANTIAL SHELTER.
COOPER
LAT...LON 4062 10526 4045 10515 4054 10473 4081 10493What forecasters said that day
The local office's own words before this severe thunderstorm 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, May 10, 11:15 AM MDT, 5 hours 59 minutes before
COZ030-032>050-110600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1115 AM MDT SUN MAY 10 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: A SURFACE TROUGH IS DEVELOPING ALONG THE FRONT RANGE FOOTHILLS LATE THIS MORNING...AND IS NOT EXPECTED TO MOVE MUCH UNTIL THIS EVENING. INITIAL CONVECTION WILL FIRE OVER THE MOUNTAINS AND FOOTHILLS INITIALLY AFTER 130 PM...THEN BEGIN TO MOVE OUT ONTO THE URBAN CORRIDOR AROUND 230 PM. OUT FURTHER EAST...THE ATMOSPHERE IS MORE STABLE...HOWEVER THUNDERSTORMS WILL BEGIN TO DEVELOP AS THE SURFACE TROUGH PUSHES SLOWLY EASTWARD LATER THIS AFTERNOON AND EVENING. ANOTHER AREA OF DEVELOPMENT WILL BE ALONG THE COLORADO AND WYOMING BORDERS ACROSS LARIMER AND WELD COUNTIES...WITH THE THUNDERSTORMS DEVELOPING THERE AFTER 2 PM. AN UPPER LEVEL LOW PRESSURE SYSTEM OVER THE GREAT BASIN WILL ALSO AID IN THUNDERSTORMS AS THE ATMOSPHERE BECOMES MORE UNSTABLE WITH TIME. THE MAIN THREAT THROUGH THIS EVENING WILL BE SOME ISOLATED REPORTS OF LARGE HAIL. SPOTTER ACTIVATION MAY BE NEEDED LATER THIS AFTERNOON AND INTO THE EVENING...AS THE SURFACE TROUGH MOVES INTO AREAS OF HIGHER INSTABILITY AND GREATER WIND SHEAR. ENTREKIN
Special weather statement, May 10, 11:15 AM MDT, 5 hours 59 minutes before
COZ030-032>050-110600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1115 AM MDT SUN MAY 10 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: A SURFACE TROUGH IS DEVELOPING ALONG THE FRONT RANGE FOOTHILLS LATE THIS MORNING...AND IS NOT EXPECTED TO MOVE MUCH UNTIL THIS EVENING. INITIAL CONVECTION WILL FIRE OVER THE MOUNTAINS AND FOOTHILLS INITIALLY AFTER 130 PM...THEN BEGIN TO MOVE OUT ONTO THE URBAN CORRIDOR AROUND 230 PM. OUT FURTHER EAST...THE ATMOSPHERE IS MORE STABLE...HOWEVER THUNDERSTORMS WILL BEGIN TO DEVELOP AS THE SURFACE TROUGH PUSHES SLOWLY EASTWARD LATER THIS AFTERNOON AND EVENING. ANOTHER AREA OF DEVELOPMENT WILL BE ALONG THE COLORADO AND WYOMING BORDERS ACROSS LARIMER AND WELD COUNTIES...WITH THE THUNDERSTORMS DEVELOPING THERE AFTER 2 PM. AN UPPER LEVEL LOW PRESSURE SYSTEM OVER THE GREAT BASIN WILL ALSO AID IN THUNDERSTORMS AS THE ATMOSPHERE BECOMES MORE UNSTABLE WITH TIME. THE MAIN THREAT THROUGH THIS EVENING WILL BE SOME ISOLATED REPORTS OF LARGE HAIL. SPOTTER ACTIVATION MAY BE NEEDED LATER THIS AFTERNOON AND INTO THE EVENING...AS THE SURFACE TROUGH MOVES INTO AREAS OF HIGHER INSTABILITY AND GREATER WIND SHEAR. ENTREKIN
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 5:26 PM MDT | Severe Thunderstorm Warning | BOU | Larimer | 49 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 1998Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.