Alert archive / Nebraska / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 41, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at May 20, 1998, 4:13 PM MDT for Sioux County, Nebraska. It was in force for 32 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 20, 1998, 4:13 PM MDT (22:13 UTC)
- Expired
- May 20, 1998, 4:45 PM MDT
- In force
- 32 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Sioux County, NE
The radar
The Cheyenne radar (KCYS), 172 km from the middle of the area, began a volume at 22:13 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 20, 1:30 PM MDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 10.2 hours before the alert went out and 294 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
- 2106 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 110 m²/s²
- 0-3 km storm-relative helicity
- 87 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
735 WUUS1 KCYS 202214 RRA SVRCYS NEC165-202245- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 413 PM MDT WED MAY 20 1998 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN SIOUX COUNTY IN NORTHWESTERN NEBRASKA PANHANDLE * UNTIL 445 PM MDT * AT 411 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 25 MILES SOUTH OF HARRISON NEBRASKA... MOVING NORTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE... OVER OPEN COUNTRY 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 20, 12:30 PM MDT, 3 hours 43 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
1230 PM MDT WED MAY 20 1998
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0402 PM 3 NE BURNS WY TORNADO
05/19/98 LARAMIE TOUCHED DOWN BRIEFLY THEN
DISSIPATED
0432 PM 5 SSE PINE BLUFFS NE TORNADO
05/19/98 KIMBALL ON GROUND LESS THAN A
MINUTE
ENDLocal storm report, May 20, 12:30 PM MDT, 3 hours 43 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
1230 PM MDT WED MAY 20 1998
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0402 PM 3 NE BURNS WY TORNADO
05/19/98 LARAMIE TOUCHED DOWN BRIEFLY THEN
DISSIPATED
0432 PM 5 SSE PINE BLUFFS NE TORNADO
05/19/98 KIMBALL ON GROUND LESS THAN A
MINUTE
ENDSpecial weather statement, May 20, 1:50 PM MDT, 2 hours 23 minutes before
NEZ001>003-019>021-054-055-WYZ059-060-067-068-070-210100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 150 PM MDT WED MAY 20 1998 ...A TORNADO WATCH HAS BEEN ISSUED FOR MUCH OF EASTERN WYOMING UNTIL 7 PM MDT... THE STORM PREDICTIONS CENTER HAS ISSUED A TORNADO WATCH FOR MUCH OF EASTERN WYOMING AND THE NEBRASKA PANHANDLE UNTIL 7 PM MDT. AT 145 PM MDT...DOPPLER WEATHER RADAR INDICATED A LINE OF SHOWERS AND THUNDERSTORMS EXTENDING FROM NEAR DOUGLAS TO JUST EAST OF WHEATLAND TO NEAR CHEYENNE. THE STRONGEST STORM WAS LOCATED 12 MILES SOUTHEAST OF WHEATLAND. ANOTHER STRONG STORM WAS LOCATED 20 MILES NORTH OF CHEYENNE. THESE STORMS ARE CAPABLE OF STRONG GUSTY WINDS...SMALL HAIL...AND DANGEROUS LIGHTNING. A WATCH MEANS THAT WEATHER CONDITIONS ARE FAVORABLE FOR THE FORMATION OF SEVERE THUNDERSTORMS IN AND NEAR THAT AREA. STEPS SHOULD BE TAKEN TO FIND THE SAFEST AREA IN YOUR LOCATION. PEOPLE IN EASTERN WYOMING AND THE NEBRASKA PANHANDLE SHOULD BE ALERT FOR THUNDERSTORMS. IF A STORM APPROACHES YOUR AREA MOVE TO A SAFE SHELTER UNTIL IT PASSES. WCJIN-WYNE-WYSE LRE
Special weather statement, May 20, 1:50 PM MDT, 2 hours 23 minutes before
NEZ001>003-019>021-054-055-WYZ059-060-067-068-070-210100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 150 PM MDT WED MAY 20 1998 ...A TORNADO WATCH HAS BEEN ISSUED FOR MUCH OF EASTERN WYOMING UNTIL 7 PM MDT... THE STORM PREDICTIONS CENTER HAS ISSUED A TORNADO WATCH FOR MUCH OF EASTERN WYOMING AND THE NEBRASKA PANHANDLE UNTIL 7 PM MDT. AT 145 PM MDT...DOPPLER WEATHER RADAR INDICATED A LINE OF SHOWERS AND THUNDERSTORMS EXTENDING FROM NEAR DOUGLAS TO JUST EAST OF WHEATLAND TO NEAR CHEYENNE. THE STRONGEST STORM WAS LOCATED 12 MILES SOUTHEAST OF WHEATLAND. ANOTHER STRONG STORM WAS LOCATED 20 MILES NORTH OF CHEYENNE. THESE STORMS ARE CAPABLE OF STRONG GUSTY WINDS...SMALL HAIL...AND DANGEROUS LIGHTNING. A WATCH MEANS THAT WEATHER CONDITIONS ARE FAVORABLE FOR THE FORMATION OF SEVERE THUNDERSTORMS IN AND NEAR THAT AREA. STEPS SHOULD BE TAKEN TO FIND THE SAFEST AREA IN YOUR LOCATION. PEOPLE IN EASTERN WYOMING AND THE NEBRASKA PANHANDLE SHOULD BE ALERT FOR THUNDERSTORMS. IF A STORM APPROACHES YOUR AREA MOVE TO A SAFE SHELTER UNTIL IT PASSES. WCJIN-WYNE-WYSE LRE
Special weather statement, May 20, 2:59 PM MDT, 1 hour 14 minutes before
NEZ001>003-019>021-054-055-WYZ059-060-067-068-070-202155- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 259 PM MDT WED MAY 20 1998 ...A TORNADO WATCH REMAINS IN EFFECT FOR MUCH OF SOUTHEAST WYOMING AND THE WESTERN NEBRASKA PANHANDLE... AT 255 PM MDT DOPPLER WEATHER RADAR INDICATED SCATTERED SHOWERS AND THUNDERSTORMS OVER MAINLY SOUTHEAST WYOMING. THE STRONGEST THUNDERSTORM WAS LOCATED 10 MILES WEST OF TORRINGTON WYOMING. THE STORMS WERE MOVING NORTHEAST AT 15 MPH. ANOTHER STRONG THUNDERSTORM WAS LOCATED JUST SOUTH OF HARRRISON NEBRASKA. THESE STORMS ARE CAPABLE OF PRODUCING SMALL HAIL... STRONG GUSTY WINDS...AND DANGEROUS LIGHTNING. IF YOU ARE IN THE PATH OF THESE TFHUNDERSTORMS TAKE SHELTER IN A STURDY BUILDING UNTIL THE STORM PASSES. LRE WCJIN-WYSE-WYNE
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 6:09 PM MDT | Severe Thunderstorm Warning | CYS | Dawes | 46 min |
| May 19, 6:27 PM MDT | Severe Thunderstorm Warning | CYS | Morrill | 33 min |
| May 19, 6:38 PM MDT | Severe Thunderstorm Warning | CYS | Dawes | 32 min |
| May 19, 6:56 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 29 min |
| May 19, 7:26 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 44 min |
| May 19, 9:19 PM MDT | Severe Thunderstorm Warning | CYS | Morrill | 31 min |
| May 19, 9:39 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 31 min |
| May 20, 4:46 PM MDT | Severe Thunderstorm Warning | CYS | Scotts Bluff | 34 min |
| May 20, 5:28 PM MDT | Severe Thunderstorm Warning | CYS | Morrill | 32 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.