Alert archive / Colorado / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 29, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 21, 1998, 8:01 PM MDT for Morgan County, Weld County, Colorado. It was in force for 39 min. 1 report 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 21, 1998, 8:01 PM MDT (02:01 UTC)
- Expired
- May 21, 1998, 8:40 PM MDT
- In force
- 39 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Morgan County, CO, Weld County, CO
The radar
The Cheyenne radar (KCYS), 97 km from the middle of the area, began a volume at 02:00 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 21, 8:07 PM MDT | Hail 0.75 | Buckingham, 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 00:00Z, 2.0 hours before the alert went out and 101 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.
570
WUUS1 KDEN 220204 RRA
SVRDEN
COC087-123-220240-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
801 PM MDT THU MAY 21 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTH CENTRAL MORGAN COUNTY IN NORTHEAST COLORADO
EAST CENTRAL WELD COUNTY IN NORTHEAST COLORADO
* UNTIL 840 PM MDT
* AT 759 PM MDT WEATHER SERVICE RADAR REPORTED A SEVERE THUNDERSTORM
9 MILES SOUTHWEST OF NEW RAYMER...OR ABOUT 23 MILES NORTH OF FORT
MORGAN... MOVING NORTHEAST AT 15 MILES PER HOUR.
* LOCATIONS IN THE WARNING INCLUDE...NEW RAYMER AND STONEHAM
THE PUBLIC REPORTED 1 INCH DIAMETER HAIL EARLIER WITH THIS STORM.
THE STORM HAS WEAKENED AT THE MOMENT...BUT IS EXPECTED TO INTENSIFY
WITHIN THE NEXT 15 MINUTES AS IT APPROACHED THE NEW RAYMER AREA.
IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER
AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE
THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS OVER 60
MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
ENTREKIN
LAT...LON 4060 10408 4048 10390 4061 10364 4079 10380What 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 21, 4:16 PM MDT, 3 hours 45 minutes before
COZ043-044-212245- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 416 PM MDT THU MAY 21 1998 ...THUNDERSTORM IN FAR EAST CENTRAL WELD AND WEST CENTRAL MORGAN COUNTIES OF COLORADO AT 409 PM MDT THE PUBLIC REPORTED A POSSIBLE TORNADO BETWEEN FORT MORGAN AND WIGGINS. WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM ABOUT 3 MILES SOUTH OF ORCHARD...OR ABOUT 16 MILES WEST OF FORT MORGAN...MOVING NORTHEAST AT 30 MILES PER HOUR. THIS STORM LIES ALONG A BOUNDARY WHICH MAY PRODUCE A BRIEF FUNNEL CLOUD OR LANDSPOUT. PERSONS IN OR NEAR GOODRICH...JACKSON RESERVOIR...ORCHARD...WELDONA AND WIGGINS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. ENTREKIN
Special weather statement, May 21, 4:16 PM MDT, 3 hours 45 minutes before
COZ043-044-212245- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 416 PM MDT THU MAY 21 1998 ...THUNDERSTORM IN FAR EAST CENTRAL WELD AND WEST CENTRAL MORGAN COUNTIES OF COLORADO AT 409 PM MDT THE PUBLIC REPORTED A POSSIBLE TORNADO BETWEEN FORT MORGAN AND WIGGINS. WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM ABOUT 3 MILES SOUTH OF ORCHARD...OR ABOUT 16 MILES WEST OF FORT MORGAN...MOVING NORTHEAST AT 30 MILES PER HOUR. THIS STORM LIES ALONG A BOUNDARY WHICH MAY PRODUCE A BRIEF FUNNEL CLOUD OR LANDSPOUT. PERSONS IN OR NEAR GOODRICH...JACKSON RESERVOIR...ORCHARD...WELDONA AND WIGGINS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. ENTREKIN
Local storm report, May 21, 5:30 PM MDT, 2 hours 31 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, 2 hours 31 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, 1 hour 21 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, 1 hour 21 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
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, 8:55 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Phillips | 35 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.