Alert archive / Colorado / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 1, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 4, 1998, 2:59 PM MDT for Weld County, Colorado. It was in force for 46 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
- May 4, 1998, 2:59 PM MDT (20:59 UTC)
- Expired
- May 4, 1998, 3:45 PM MDT
- In force
- 46 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Weld County, CO
The radar
The Cheyenne radar (KCYS), 58 km from the middle of the area, began a volume at 21:02 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, 9.0 hours before the alert went out and 158 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3187 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 109 m²/s²
- 0-3 km storm-relative helicity
- 94 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
642
WUUS1 KDEN 042101 RRA
SVRDEN
COC123-042145-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
259 PM MDT MON MAY 4 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
WEST CENTRAL WELD COUNTY IN NORTHEAST COLORADO
* UNTIL 345 PM MDT
* AT 253 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 8 MILES WEST OF NUNN...OR ABOUT 11 MILES
NORTHEAST OF FORT COLLINS...MOVING EAST AT 20 MILES PER HOUR.
* LOCATIONS IN THE WARNING INCLUDE NORTHEASTERN GREELEY...AULT...
EATON...LUCERNE...NUNN...PIERCE AND PURCELL
HAIL UP TO 3/4 INCHES IN DIAMETER HAS BEEN REPORTED WITH THIS STORM
12 MILES NORTHEAST OF FORT COLLINS. IF YOU ARE IN THE PATH OF THE
STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A SUBSTANTIAL SHELTER.
LAT...LON 4070 10493 4062 10494 4043 10470 4071 10454
GARD...WSFO DENVERWhat 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 4, 11:10 AM MDT, 3 hours 49 minutes before
COZ030-032>050-050600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1110 AM MDT MON MAY 4 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 ...SPOTTER ACTIVATION WILL NOT BE NECESSARY TODAY OR TONIGHT... SYNOPSIS: A COLD FRONT MOVING OUT OF WYOMING AND NEBRASKA WILL BRING GUSTY NORTHERLY WINDS ACROSS THE PLAINS THIS AFTERNOON. WIND SPEEDS OF 15 TO 25 MPH WITH SOME GUSTS TO 35 MPH MAY PRODUCE SOME AREAS OF BLOWING DUST. COOLER AIR MOVING INTO THE STATE BEHIND THE COLD FRONT WILL HELP TO STABILIZE THE AIRMASS AND INHIBIT ANY AFTERNOON SHOWER ACTIVITY ON THE PLAINS. SOME CLOUDS AND SHOWERS MAY STILL DEVELOP OVER THE MOUNTAINS AND FOOTHILLS DURING THE AFTERNOON...BUT THE AIRMASS OVER THE CENTRAL PART OF THE STATE IS QUITE DRY...SO ONLY ISOLATED SHOWERS ARE EXPECTED. NONE OF THE STORMS WHICH DEVELOP WILL PRODUCE ANY SIGNIFICANT WEATHER. OUTLOOK FOR TUESDAY...COOL AND MOIST AIR WILL REMAIN OVER NORTHEAST COLORADO TOMORROW WITH SCATTERED RAIN SHOWERS IN THE MORNING AND A FEW THUNDERSTORMS POSSIBLE IN THE AFTERNOON. DANKERS
Special weather statement, May 4, 11:10 AM MDT, 3 hours 49 minutes before
COZ030-032>050-050600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1110 AM MDT MON MAY 4 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 ...SPOTTER ACTIVATION WILL NOT BE NECESSARY TODAY OR TONIGHT... SYNOPSIS: A COLD FRONT MOVING OUT OF WYOMING AND NEBRASKA WILL BRING GUSTY NORTHERLY WINDS ACROSS THE PLAINS THIS AFTERNOON. WIND SPEEDS OF 15 TO 25 MPH WITH SOME GUSTS TO 35 MPH MAY PRODUCE SOME AREAS OF BLOWING DUST. COOLER AIR MOVING INTO THE STATE BEHIND THE COLD FRONT WILL HELP TO STABILIZE THE AIRMASS AND INHIBIT ANY AFTERNOON SHOWER ACTIVITY ON THE PLAINS. SOME CLOUDS AND SHOWERS MAY STILL DEVELOP OVER THE MOUNTAINS AND FOOTHILLS DURING THE AFTERNOON...BUT THE AIRMASS OVER THE CENTRAL PART OF THE STATE IS QUITE DRY...SO ONLY ISOLATED SHOWERS ARE EXPECTED. NONE OF THE STORMS WHICH DEVELOP WILL PRODUCE ANY SIGNIFICANT WEATHER. OUTLOOK FOR TUESDAY...COOL AND MOIST AIR WILL REMAIN OVER NORTHEAST COLORADO TOMORROW WITH SCATTERED RAIN SHOWERS IN THE MORNING AND A FEW THUNDERSTORMS POSSIBLE IN THE AFTERNOON. DANKERS
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.