Alert archive / Nebraska / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 45, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at May 20, 1998, 7:39 PM MDT for Cheyenne County, Nebraska. It was in force for 31 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 20, 1998, 7:39 PM MDT (01:39 UTC)
- Expired
- May 20, 1998, 8:10 PM MDT
- In force
- 31 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Cheyenne County, NE
The radar
The Cheyenne radar (KCYS), 152 km from the middle of the area, began a volume at 01:40 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 20, 8:00 PM MDT | Hail 1 | Dalton, NE | A storm produced quarter size hail 6 miles east of Dalton. The hail fell for 50 minutes and caused considerable crop damage. |
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, 1.7 hours before the alert went out and 151 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
- 87 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 3075 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- -42 m²/s²
- 0-3 km storm-relative helicity
- 46 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
935 WUUS1 KCYS 210141 RRA SVRCYS NEC033-210210- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 739 PM MDT WED MAY 20 1998 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN CHEYENNE COUNTY IN WESTERN NEBRASKA PANHANDLE * UNTIL 810 PM MDT * AT 728 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 15 MILES NORTHEAST OF SIDNEY... MOVING SOUTHEAST AT 15 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... DALTON NOW 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. 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
Special weather statement, May 20, 1:50 PM MDT, 5 hours 49 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, 4 hours 40 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
Local storm report, May 20, 5:46 PM MDT, 1 hour 53 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
546 PM MDT WED MAY 20 1998
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0540 PM BAYARD NE 1.75 INCH HAIL
05/20/98 MORRILL
DAUGHERTYSpecial weather statement, May 20, 7:25 PM MDT, 14 minutes before
NEZ001>003-019-WYZ059-060-067-068-070-210140- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 725 PM MDT WED MAY 20 1998 ...THE TORNADO WATCH HAS BEEN EXTENDED UNTIL 8 PM FOR BANNER... MORRILL... KIMBALL AND CHEYENE COUNTIES NEBRASKA. THE TORNADO WATCH EXPIRED FOR THE FOLLOWING COUNTIES IN THE NEBRASKA PANHANDLE...SIOUX...DAWS...SCOTTS BLUFF AND BOX BUTTE. THE TORNADO WATCH EXPIRED FOR THE FOLLOWING COUNTIES IN EASTERN WYOMING...CONVERSE...NIOBRARA...PLATTE...GOSHEN...AND EASTERN LARAMIE. PAL
Special weather statement, May 20, 7:25 PM MDT, 14 minutes before
NEZ001>003-019-WYZ059-060-067-068-070-210140- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 725 PM MDT WED MAY 20 1998 ...THE TORNADO WATCH HAS BEEN EXTENDED UNTIL 8 PM FOR BANNER... MORRILL... KIMBALL AND CHEYENE COUNTIES NEBRASKA. THE TORNADO WATCH EXPIRED FOR THE FOLLOWING COUNTIES IN THE NEBRASKA PANHANDLE...SIOUX...DAWS...SCOTTS BLUFF AND BOX BUTTE. THE TORNADO WATCH EXPIRED FOR THE FOLLOWING COUNTIES IN EASTERN WYOMING...CONVERSE...NIOBRARA...PLATTE...GOSHEN...AND EASTERN LARAMIE. PAL
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, 7:54 PM MDT | Tornado Warning | CYS | Cheyenne | 31 min |
| May 20, 8:49 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 31 min |
| May 21, 4:57 AM MDT | Severe Thunderstorm Warning | CYS | Box Butte | 48 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.