Alert archive / Nebraska / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 47, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at May 21, 1998, 4:57 AM MDT for Box Butte County, Nebraska. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 21, 1998, 4:57 AM MDT (10:57 UTC)
- Expired
- May 21, 1998, 5:45 AM MDT
- In force
- 48 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Box Butte County, NE
The radar
The Cheyenne radar (KCYS), 186 km from the middle of the area, began a volume at 10:59 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
Rapid City, SD (KUNR), launched 00:00Z, 11.0 hours before the alert went out and 206 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
- 1780 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- -39 m²/s²
- 0-3 km storm-relative helicity
- 50 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
464 WUUS1 KCYS 211101 RRA SVRCYS NEC013-211145- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 457 AM MDT THU MAY 21 1998 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WESTERN BOX BUTTE COUNTY IN THE NORTHWESTERN NEBRASKA PANHANDLE * UNTIL 545 AM MDT. * AT 455 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 25 MILES WEST OF ALLIANCE OR 18 MILES NORTHWEST OF SCOTTSBLUFF. THE SEVERE STORM WAS MOVING TO THE NORTH AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... KIRKPATRICK LAKE BY 505 AM. DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS WEILAND
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
Special weather statement, May 21, 4:16 AM MDT, 41 minutes before
NEZ001>003-019-211300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 416 AM MDT THU MAY 21 1998 ...A STRONG THUNDERSTORM HAS DEVELOPED IN EXTREME NORTHEAST SCOTTS BLUFF COUNTY... AT 410 AM...A STRONG THUNDERSTORM WAS LOCATED NEAR LAKE MINATARE IN THE NORTHEAST CORNER OF SCOTTS BLUFF COUNTY. THIS STORM WAS MOVING TO THE NORTH AT 20 MPH. AS THE STRONG THUNDERSTORM MOVES INTO SOUTHEAST SIOUX COUNTY AND WEST BOX BUTTE COUNTIES...HAIL UP TO ONE HALF INCH IN DIAMETER AND BRIEF HEAVY RAIN CAN BE EXPECTED. PEOPLE IN SOUTHEAST SIOUX COUNTY...WEST BOX BUTTE COUNTY AND NORTHEAST SCOTTS BLUFF COUNTY SHOULD BE AWARE OF THE APPROACHING STORM AND REMAIN INDOORS. < WEILAND
Special weather statement, May 21, 4:16 AM MDT, 41 minutes before
NEZ001>003-019-211300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 416 AM MDT THU MAY 21 1998 ...A STRONG THUNDERSTORM HAS DEVELOPED IN EXTREME NORTHEAST SCOTTS BLUFF COUNTY... AT 410 AM...A STRONG THUNDERSTORM WAS LOCATED NEAR LAKE MINATARE IN THE NORTHEAST CORNER OF SCOTTS BLUFF COUNTY. THIS STORM WAS MOVING TO THE NORTH AT 20 MPH. AS THE STRONG THUNDERSTORM MOVES INTO SOUTHEAST SIOUX COUNTY AND WEST BOX BUTTE COUNTIES...HAIL UP TO ONE HALF INCH IN DIAMETER AND BRIEF HEAVY RAIN CAN BE EXPECTED. PEOPLE IN SOUTHEAST SIOUX COUNTY...WEST BOX BUTTE COUNTY AND NORTHEAST SCOTTS BLUFF COUNTY SHOULD BE AWARE OF THE APPROACHING STORM AND REMAIN INDOORS. < WEILAND
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 6:10 PM MDT | Severe Thunderstorm Warning | CYS | Morrill | 30 min |
| May 20, 6:29 PM MDT | Tornado Warning | CYS | Morrill | 31 min |
| May 20, 6:59 PM MDT | Tornado Warning | CYS | Morrill | 31 min |
| May 20, 7:39 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 31 min |
| May 20, 7:54 PM MDT | Tornado Warning | CYS | Cheyenne | 31 min |
| May 20, 8:49 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 31 min |
| May 21, 5:48 AM MDT | Severe Thunderstorm Warning | CYS | Box Butte | 37 min |
| May 21, 10:55 AM MDT | Tornado Warning | CYS | Scotts Bluff, Sioux | 30 min |
| May 21, 11:30 AM MDT | Tornado Warning | CYS | Scotts Bluff | 35 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 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.