Alert archive / Wyoming / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 50, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at May 21, 1998, 6:27 PM MDT for Niobrara County, Wyoming. It was in force for 48 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- May 21, 1998, 6:27 PM MDT (00:27 UTC)
- Expired
- May 21, 1998, 7:15 PM MDT
- In force
- 48 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Niobrara County, WY
The radar
The Rapid City radar (KUDX), 178 km from the middle of the area, began a volume at 00:31 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, 6:40 PM MDT | Hail 1 | Lusk, WY | A storm produced quarter size hail in Lusk. |
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
Rapid City, SD (KUNR), launched 00:00Z, 0.5 hours before the alert went out and 171 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
- 85 J/kg
- Mixed-layer CIN
- -45 J/kg
- Mixed-layer LCL
- 585 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
888 WUUS1 KCYS 220029 RRA SVRCYS WYC027-220115- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 627 PM MDT THU MAY 21 1998 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN NIOBRARA COUNTY IN EASTERN WYOMING * UNTIL 715 PM MDT * AT 627 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 7 MILES SOUTH OF LUSK... MOVING NORTH AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... LUSK 645 PM GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS A TORNADO WATCH IS IN EFFECT. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MPH... DESTRUCTIVE HAIL... DEADLY LIGHTNING... AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DONT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. PAL
What 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, 12:46 PM MDT, 5 hours 41 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
1246 PM MDT THU MAY 21 1998
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1030 AM VAN TASSEL WY HAIL
05/21/98 NIOBRARA MARBLE AND LARGER SIZED
HAIL
1035 AM VAN TASSEL WY TORNADO
05/21/98 NIOBRARA 1 TORNADO CROSSED HWY
20...2 FUNNEL CLOUDS
1050 AM HENRY NE TORNADO
05/21/98 SCOTTSBLUFF TORNADO ALONG HWY 26
1058 AM 2 1/2 S MORRILL NE TORNADO
05/21/98 SCOTTSBLUFF 1 TORNADO ON GROUND
1103 AM MORRILL NE TORNADO
05/21/98 SCOTTS BLUFF 2 TORNADOS ON GROUND.
DESTROYED BARN. WINDOWS
BLOWN OUT IN TRAILER PARK
1127 AM MORRILL NE TORNADO
05/21/98 SCOTTS BLUFF TORNADO 3 MILES SE MORRILL
1100 AM 4 N MORRILL NE HAIL
05/21/98 SCOTTBLUFF PEA TO MARBLE SIZE HAIL
LRELocal storm report, May 21, 12:46 PM MDT, 5 hours 41 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
1246 PM MDT THU MAY 21 1998
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1030 AM VAN TASSEL WY HAIL
05/21/98 NIOBRARA MARBLE AND LARGER SIZED
HAIL
1035 AM VAN TASSEL WY TORNADO
05/21/98 NIOBRARA 1 TORNADO CROSSED HWY
20...2 FUNNEL CLOUDS
1050 AM HENRY NE TORNADO
05/21/98 SCOTTSBLUFF TORNADO ALONG HWY 26
1058 AM 2 1/2 S MORRILL NE TORNADO
05/21/98 SCOTTSBLUFF 1 TORNADO ON GROUND
1103 AM MORRILL NE TORNADO
05/21/98 SCOTTS BLUFF 2 TORNADOS ON GROUND.
DESTROYED BARN. WINDOWS
BLOWN OUT IN TRAILER PARK
1127 AM MORRILL NE TORNADO
05/21/98 SCOTTS BLUFF TORNADO 3 MILES SE MORRILL
1100 AM 4 N MORRILL NE HAIL
05/21/98 SCOTTBLUFF PEA TO MARBLE SIZE HAIL
LRELocal storm report, May 21, 1:20 PM MDT, 5 hours 7 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
120 PM MDT THU MAY 21 1998
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1030 AM VAN TASSEL WY HAIL
05/21/98 NIOBRARA MARBLE AND LARGER SIZED
HAIL
1035 AM VAN TASSEL WY TORNADO
05/21/98 NIOBRARA 1 TORNADO CROSSED HWY
20...2 FUNNEL CLOUDS
1050 AM HENRY NE TORNADO
05/21/98 SCOTTSBLUFF TORNADO ALONG HWY 26
1058 AM 2 1/2 S TO 3 E MORRILL NE TORNADO
05/21/98 SCOTTSBLUFF BARN DESTROYED AND TREES
UPROOTED IN GOLF COURSE
1100 AM 4 N MORRILL NE HAIL
05/21/98 SCOTTBLUFF PEA TO MARBLE SIZE HAIL
1103 AM JUST W OF MORRILL NE TORNADO
05/21/98 SCOTTS BLUFF WINDOWS BLOWN OUT IN
TRAILER PARK ON WEST SIDE.
1117 AM MITCHELL NE TORNADO
05/21/98 SCOTTS BLUFF TORNADO NEAR GOLF COURSE
ON NORTH SIDE OF MITCHELL
1130 AM MITCHELL NE TORNADO
05/21/98 SCOTTS BLUFF TORNADO 2 1/2 MILES
SOUTHWEST OF MITCHELL
ALONG COUNTY ROAD H
LRE
ENDLocal storm report, May 21, 1:20 PM MDT, 5 hours 7 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
120 PM MDT THU MAY 21 1998
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1030 AM VAN TASSEL WY HAIL
05/21/98 NIOBRARA MARBLE AND LARGER SIZED
HAIL
1035 AM VAN TASSEL WY TORNADO
05/21/98 NIOBRARA 1 TORNADO CROSSED HWY
20...2 FUNNEL CLOUDS
1050 AM HENRY NE TORNADO
05/21/98 SCOTTSBLUFF TORNADO ALONG HWY 26
1058 AM 2 1/2 S TO 3 E MORRILL NE TORNADO
05/21/98 SCOTTSBLUFF BARN DESTROYED AND TREES
UPROOTED IN GOLF COURSE
1100 AM 4 N MORRILL NE HAIL
05/21/98 SCOTTBLUFF PEA TO MARBLE SIZE HAIL
1103 AM JUST W OF MORRILL NE TORNADO
05/21/98 SCOTTS BLUFF WINDOWS BLOWN OUT IN
TRAILER PARK ON WEST SIDE.
1117 AM MITCHELL NE TORNADO
05/21/98 SCOTTS BLUFF TORNADO NEAR GOLF COURSE
ON NORTH SIDE OF MITCHELL
1130 AM MITCHELL NE TORNADO
05/21/98 SCOTTS BLUFF TORNADO 2 1/2 MILES
SOUTHWEST OF MITCHELL
ALONG COUNTY ROAD H
LRE
ENDLocal storm report, May 21, 3:27 PM MDT, 3 hours before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
327 PM MDT THU MAY 21 1998
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0208 PM 3 SE ALLIANCE NE WIND DAMAGE
05/21/98 BOX BUTTE POWER POLES DOWNED,
WINDOWS BLOWN OUT OF HOME
AND CAR BY APPARANT
MICROBURST
JBSLocal storm report, May 21, 3:27 PM MDT, 3 hours before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
327 PM MDT THU MAY 21 1998
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0208 PM 3 SE ALLIANCE NE WIND DAMAGE
05/21/98 BOX BUTTE POWER POLES DOWNED,
WINDOWS BLOWN OUT OF HOME
AND CAR BY APPARANT
MICROBURST
JBSNearby
Severe Thunderstorm Warnings in Wyoming, 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.