Alert archive / Colorado / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 30, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 21, 1998, 8:55 PM MDT for Logan County, Phillips County, Colorado. It was in force for 35 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 21, 1998, 8:55 PM MDT (02:55 UTC)
- Expired
- May 21, 1998, 9:30 PM MDT
- In force
- 35 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Logan County, CO, Phillips County, CO
The radar
The Goodland radar (KGLD), 159 km from the middle of the area, began a volume at 02:55 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, 2.9 hours before the alert went out and 85 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
- 600 J/kg
- Mixed-layer CIN
- -98 J/kg
- Mixed-layer LCL
- 2597 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- -67 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
825
WUUS1 KDEN 220256 RRA
SVRDEN
COC075-095-220330-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
855 PM MDT THU MAY 21 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN LOGAN COUNTY IN NORTHEAST COLORADO
WEST CENTRAL PHILLIPS COUNTY IN NORTHEAST COLORADO
* UNTIL 930 PM MDT
* AT 852 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 5 MILES SOUTH OF ST PETERSBURG...OR ABOUT 24
MILES SOUTHEAST OF STERLING...MOVING NORTHEAST AT 20 MILES PER
HOUR.
* LOCATIONS IN THE WARNING INCLUDE...HAXTUN...HIGHLAND CENTER AND ST
PETERSBURG
LESZCYNSKI
LAT...LON 4050 10293 4044 10277 4058 10247 4071 10268What 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
Local storm report, May 21, 5:30 PM MDT, 3 hours 25 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
530 PM MDT THU MAY 21 1998
...PRELIMINARY STORM REPORT FOR MAY 21 1998...
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0430 PM 18 N NEW RAYMER CO 0.75 INCH HAIL
05/21/98 WELD
0430 PM 11 NE PAWNEE BUTTES CO 0.75 INCH HAIL
05/21/98 WELD
0435 PM 15 NE PAWNEE BUTTES CO 1.00 INCH HAIL
05/21/98 WELD
0445 PM 18 NE PAWNEE BUTTES CO 0.75 INCH HAIL
05/21/98 WELD
RAYLocal storm report, May 21, 5:30 PM MDT, 3 hours 25 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
530 PM MDT THU MAY 21 1998
...PRELIMINARY STORM REPORT FOR MAY 21 1998...
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0430 PM 18 N NEW RAYMER CO 0.75 INCH HAIL
05/21/98 WELD
0430 PM 11 NE PAWNEE BUTTES CO 0.75 INCH HAIL
05/21/98 WELD
0435 PM 15 NE PAWNEE BUTTES CO 1.00 INCH HAIL
05/21/98 WELD
0445 PM 18 NE PAWNEE BUTTES CO 0.75 INCH HAIL
05/21/98 WELD
RAYLocal storm report, May 21, 6:40 PM MDT, 2 hours 15 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
0640 PM MDT THU MAY 21 1998
...PRELIMINARY STORM REPORT FOR MAY 21 1998...
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0536 PM 5 E JUELSBURG CO 1.75 INCH HAIL
05/21/98 SEDGWICK
0530 PM 12 SE SEDGWICK CO 0.75 INCH HAIL
05/21/98 SEDGWICK
0539 PM STERLING RES. C0 1.75 INCH HAIL
05/21/98 LOGAN
0542 PM 5 N WESTPLAINS CO 1.75 INCH HAIL
05/21/98 LOGAN
0545 PM 10 NW HOLYOKE CO 1.75 INCH HAIL
05/21/98 PHILLIPS
0557 PM 11 N HOLYOKE CO 1.00 INCH HAIL
05/21/98 PHILLIPS
0602 PM 16 S JULESBURG CO 1.75 INCH HAIL
05/21/98 SEDGWICK
0605 PM 5 SW PEETZ C0 1.00 INCH HAIL
05/21/98 LOGAN
0607 PM 16 W JULESBURG CO 2.50 INCH HAIL
05/21/98 SEDGWICK
0615 PM AMHERST CO 2.75 INCH HAIL
05/21/98 PHILLIPS
RAYLocal storm report, May 21, 6:40 PM MDT, 2 hours 15 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
0640 PM MDT THU MAY 21 1998
...PRELIMINARY STORM REPORT FOR MAY 21 1998...
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0536 PM 5 E JUELSBURG CO 1.75 INCH HAIL
05/21/98 SEDGWICK
0530 PM 12 SE SEDGWICK CO 0.75 INCH HAIL
05/21/98 SEDGWICK
0539 PM STERLING RES. C0 1.75 INCH HAIL
05/21/98 LOGAN
0542 PM 5 N WESTPLAINS CO 1.75 INCH HAIL
05/21/98 LOGAN
0545 PM 10 NW HOLYOKE CO 1.75 INCH HAIL
05/21/98 PHILLIPS
0557 PM 11 N HOLYOKE CO 1.00 INCH HAIL
05/21/98 PHILLIPS
0602 PM 16 S JULESBURG CO 1.75 INCH HAIL
05/21/98 SEDGWICK
0605 PM 5 SW PEETZ C0 1.00 INCH HAIL
05/21/98 LOGAN
0607 PM 16 W JULESBURG CO 2.50 INCH HAIL
05/21/98 SEDGWICK
0615 PM AMHERST CO 2.75 INCH HAIL
05/21/98 PHILLIPS
RAYLocal storm report, May 21, 8:20 PM MDT, 35 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
820 PM MDT THU MAY 21 1998
...PRELIMINARY STORM REPORT FOR MAY 21 1998...
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0725 PM 9 SW FLEMING CO 1.50 INCH HAIL 05/21/98
MORGAN
0759 PM 4 S BUCKINGHAM CO 1.00 INCH HAIL
05/21/98 WELD
8007 PM 5 SE BUCKINGHAM CO 0.75 INCH HAIL 05/21/98
WELD
RAYLocal storm report, May 21, 8:20 PM MDT, 35 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
820 PM MDT THU MAY 21 1998
...PRELIMINARY STORM REPORT FOR MAY 21 1998...
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0725 PM 9 SW FLEMING CO 1.50 INCH HAIL 05/21/98
MORGAN
0759 PM 4 S BUCKINGHAM CO 1.00 INCH HAIL
05/21/98 WELD
8007 PM 5 SE BUCKINGHAM CO 0.75 INCH HAIL 05/21/98
WELD
RAYThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 6:13 PM MDT | Tornado Warning | BOU | Phillips, Sedgwick | 22 min |
| May 21, 6:15 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 45 min |
| May 21, 7:27 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 33 min |
| May 21, 8:01 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 39 min |
| May 21, 10:36 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 34 min |
| May 22, 11:56 AM MDT | Severe Thunderstorm Warning | BOU | Boulder, Jefferson | 34 min |
| May 22, 12:29 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Jefferson, Weld | 46 min |
| May 22, 12:29 PM MDT | Severe Thunderstorm Warning | BOU | Adams | 46 min |
| May 22, 1:00 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 30 min |
| May 22, 1:10 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Larimer, Weld | 25 min |
| May 22, 1:30 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 45 min |
| May 22, 1:35 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 40 min |
| May 22, 1:41 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 34 min |
| May 22, 2:06 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 39 min |
| May 22, 2:15 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 45 min |
| May 22, 2:21 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 24 min |
| May 22, 2:45 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 45 min |
| May 22, 2:58 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 32 min |
| May 22, 3:15 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 40 min |
| May 22, 3:21 PM MDT | Tornado Warning | BOU | Adams, Arapahoe | 24 min |
| May 22, 3:55 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Washington | 35 min |
| May 22, 4:11 PM MDT | Severe Thunderstorm Warning | BOU | Adams | 34 min |
| May 22, 4:30 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Morgan, Washington | 30 min |
| May 22, 4:40 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 50 min |
| May 22, 4:46 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Washington | 44 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.