Alert archive / Nebraska / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 7, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at May 18, 1990, 5:23 PM MDT for Box Butte County, Dawes County, Sheridan County, Nebraska. It was in force for 67 min. 2 reports 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 18, 1990, 5:23 PM MDT (23:23 UTC)
- Expired
- May 18, 1990, 6:30 PM MDT
- In force
- 67 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
Counties Box Butte County, NE, Dawes County, NE, Sheridan County, NE
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 18, 5:42 PM MDT | Tornado F0 | Sheridan, NE | |
| May 18, 6:00 PM MDT | Tornado F0 | Sheridan, NE |
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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Rapid City, SD (KRAP), launched 12:00Z, 11.4 hours before the alert went out and 177 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
- 1613 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 291 m²/s²
- 0-3 km storm-relative helicity
- 636 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KBFF 182323
SVRBFF
NEC045-161-013-190030-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
523 PM MDT FRI MAY 18 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 630 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN THE PANHANDLE OF NEBRASKA
EASTERN DAWES...SHERIDAN...EASTERN BOX BUTTE
AT 520 PM MDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS
OVER THE NORTH NEBRASKA PANHANDLE FROM 10 MILES NORTH OF CHADRON
NEBRASKA TO 5 MILES EAST OF ALLIANCE NEBRASKA MOVING EAST AT 25
MILES AN HOUR.
PREPARE FOR LARGE HAIL...DAMAGING WIND...HEAVY RAIN AND DANGEROUS
LIGHTNING BY TAKING COVER. STAY AWAY FROM AREAS WHERE LOOSE ITEMS
CAN BECOME DANGEROUS FLYING DEBRIS.
THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE
OR NO WARNING...SO BE ON THE LOOKOUT AND BE PREPARED TO MOVE TO A
PLACE OF SAFETY IF ONE IS SPOTTED.
WIRTH
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 18, 1:34 PM MDT, 3 hours 49 minutes before
WYZALL-182145- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 130 PM MDT FRI MAY 18 1990 ...THUNDERSTORMS DEVELOPING OVER WESTERN WYOMING... AT 100 PM MDT THUNDERSTORMS CONTINUED TO FORM OVER WESTERN WYOMING. MOST OF THE STORMS WERE IN THE SOUTHWEST QUARTER OF THE STATE. THE THUNDERSTORMS WERE MOVING EAST AT 40 MILES AN HOUR. SHORTLY BEFORE 100 PM MDT ROCK SPRINGS REPORTED A WIND GUST TO 37 MILES AN HOUR DUE TO THE NEARBY THUNDERSTORMS. THE THUNDERSTORMS WILL PRODUCE STRONG WINDS TO 50 MILES AN HOUR AND DANGEROUS LIGHTNING...BUT VERY LITTLE IN THE WAY OF RAIN OVER THE SOUTHERN AND CENTRAL PARTS OF THE STATE. THE STORMS WILL EXIT FAR WESTERN WYOMING BY MID AFTERNOON AND WILL BE EAST OF EASTERN WYOMING BY MID EVENING. UNTIL THOSE TIMES...PEOPLE OUTDOORS IN SOUTHERN AND CENTRAL WYOMING SHOULD BE AWARE OF THE THUNDERSTORMS AND THEIR DANGEROUS LIGHTNING AND SUDDEN...STRONG WINDS. IF A STORM APPROACHES...TAKE BIMMEDIATE COVER AS LIGHTNING CAN BE DEADLY. WEILAND
Special weather statement, May 18, 2:59 PM MDT, 2 hours 24 minutes before
WYZALL-182200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 259 PM MDT FRI MAY 18 1990 ...THUNDERSTORMS PRODUCING STRONG GUSTY WINDS OVER WYOMING... AT 250 PM MDT THUNDERSTORMS CONTINUED TO OCCUR THE CENTRAL AND SOUTH CENTRAL PART OF THE STATE. THESE STORMS WERE MOVING EAST AT 40 MILES MILES AN HOUR. AT 140 PM MDT WAMSUTTER REPORTED A WIND GUST OF 50 MILES AN HOUR FROM A THUNDERSTORM. AT 245 PM MDT...CASPER HAD A THUNDERSTORM WIND GUST OF 52 MILES AN HOUR. THE THUNDERSTORMS WILL PRODUCE STRONG WINDS UP TO 55 MILES AN HOUR ALONG WITH DANGEROUS LIGHTNING. HOWEVER...VERY LITTLE IN THE WAY OF RAINFALL IS EXPECTED FROM THESE STORMS. THE THUNDERSTORMS WILL CONTINUE TO MOVE EASTWARD THROUGH THE REMAINDER OF SOUTHERN WYOMING DURING THE AFTERNOON...THEN EXIT THE STATE BY MID EVENING. UNTIL THEN...PEOPLE OUTDOORS SHOULD BE AWARE OF THE DANGEROUS LIGHTNING AND THE SUDDEN...STRONG WINDS FROM THE STORMS. IF A THUNDERSTORM APPROACHES...TAKE IMMEDIATE COVER AS LIGHTNING CAN BE DEADLY. EKB
Special weather statement, May 18, 3:29 PM MDT, 1 hour 54 minutes before
NEZ001-001-011-190030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SCOTTSBLUFF NE 330 PM MDT FRI MAY 18 1990 ...TORNADO WATCH UNTIL 9PM MDT FOR NEBRASKA PANHANDLE... AT 326 PM MDT...THUNDERSTORMS WERE INTENSIFYING OVER THE WESTERN AND NORTHERN NEBRASKA PANHANDLE INTO EASTERN WYOMING. THE STRONGEST STORMS WERE LOCATED 18 MILES NORTH OF SCOTTSBLUFF NEBRASKA...WITH ANOTHER ONE 55 MILES NORTHWEST OF SCOTTSBLUFF NEAR U.S. HIGHWAY 20 BETWEEN HARRISON NEBRASKA IN SIOUX COUNTY AND LUSK WYOMING. STORMS WERE MOVING TO THE EAST AND NORTHEAST AROUND 25 MILES AN HOUR. BRIEF HEAVY RAIN...STRONG WINDS AND HAIL ARE POSSIBLE WITH THESE STORMS UNTIL 530 PM MDT AS THEY MOVE ACROSS SIOUX...SCOTTS =BLUFF...BOX BUTTE... AND DAWES COUNTIES OF THE NEBRASKA PANHANDLE. BE ALERT FOR THREATENING WEATHER CONDITIONS...AND BE PREPARED TO MOVE TO A PLACE OF SAFETY IF NECESSARY. PFEIFFER
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 3:43 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 62 min |
| May 18, 4:00 PM MDT | Tornado Warning | CYS | Sioux | 60 min |
| May 18, 4:11 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Dawes | 64 min |
| May 18, 4:52 PM MDT | Tornado Warning | CYS | Morrill | 68 min |
| May 18, 5:52 PM MDT | Tornado Warning | CYS | Sheridan | 38 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 1990Every severe thunderstorm warning in 1990
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.