Alert archive / Nebraska / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 59, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at May 27, 1991, 6:21 PM MDT for Sioux County, Nebraska. It was in force for 54 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 27, 1991, 6:21 PM MDT (00:21 UTC)
- Expired
- May 27, 1991, 7:15 PM MDT
- In force
- 54 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Sioux County, NE
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 27, 7:00 PM MDT | Hail 2.5 | Sioux, 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
Denver, CO (KDEN), launched 00:00Z, 0.4 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
- 202 J/kg
- Mixed-layer CIN
- -56 J/kg
- Mixed-layer LCL
- 2734 m above ground
- 0-6 km bulk shear
- 78 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 117 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 27, 2:08 PM MDT, 4 hours 13 minutes before
WYZ013-014-272135- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 208 PM MDT MON MAY 27 1991 ...STRONG THUNDERSTORMS HAVE DEVELOPED OVER THE SOUTHWEST CORNER WYOMING... RADAR AND LIGHTNING DETECTORS INDICATED THAT STRONG THUNDERSTORMS HAD DEVELOPED OVER SOUTHWEST WYOMING FROM NEAR EVANSTON TO NORTHWEST OF ROCK SPRINGS. THE UPPER LEVEL WINDS SHOULD STEAR THE THUNDERSTORMS TO THE NORTHEAST AT ABOUT 30 MILES AN HOUR. RESIDENTS OF SOUTHWEST WYOMING SHOULD BE ON THE ALERT FOR STORNG THUNDERSTORMS THIS AFTERNOON. IF SEVERE WEATHER IS ENCOUNTERED... SEEK SHELTER IN DOORS AND RELAY YOUR SEVERE WEATHER REPORT TO THE NATIONAL WEATHER SERVICE IN CHEYENNE THROUGH YOUR NEAREST LAW ENFORCEMENT AGENCY. LAUZE
Special weather statement, May 27, 3:19 PM MDT, 3 hours 2 minutes before
WYZ012-272200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 320 PM MDT MON MAY 27 1991 ...TORNADO WATCH FOR SOUTHEAST WYOMING VALID UNTIL 9 PM THIS EVENING... RADAR INDICATED A STRONG THUNDERSTORMS 10 MILES NORTH OF WHEATLAND MOVING TO THE NORTHEAST AT 25 MILES AN HOUR. RESIDENTS OF HARTVILLE AND GUERNSEY SHOULD KEEP AN EYE ON THE SKY FOR THE APPROACHING THUNDERSTORM UNTIL 4 PM. IF SEVERE WEATHER IS ENCOUNTERED...SEEK SHELTER IN DOORS AND RELAY YOUR SEVERE WEATHER REPORT TO THE NATIONAL WEATHER SERVICE IN CHEYENNE THROUGH YOUR NEAREST LAW ENFORCEMENT AGENCY. LAUZE
Special weather statement, May 27, 3:45 PM MDT, 2 hours 36 minutes before
WYZ011-012-014-015-016-017-272300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 345 PM MDT MON MAY 27 1991 ...A TORNADO WATCH FOR SOUTHEAST WYOMING REMAINED IN EFFECT UNTIL 9 PM THIS EVENING... THERE HAS NOT BEEN ANY REPORTS OF SEVERE THUNDERSTORMS OR TORNADOES IN THE WATCH AREA YET. THE TORNADO WATCH IN EFFECT UNTIL 9 PM FOR SOUTHEAST WYOMING INCLUDES THE SOUTHERN HALF OF NATRONA...CONVERSE AND NIOBRARA COUNTIES AND ALL OF CARBON..ALBANY...LARAMIE...PLATTE AND GOSHEN COUNTIES. RADAR DID HOWEVER SHOW THUNDERSTORMS DEVELOPING IN THE WATCH AREA. THUNDERSTORMS WERE MOVING TO THE NORTHEAST AT 25 MILES AN HOUR. RESIDENTS OF SOUTHEAST WYOMING SHOULD KEEP AN EYE ON THE SKY AND SHOULD KEEP ABREST OF THE LATEST WEATHER DEVELOPMENTS. SHOULD SEVERE WEATHER THREATEN...SEEK SHELTER AND WHEN SAFE THEN RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE THROUGH THE NEAREST LAW ENFORCEMENT AGENCY. LAUZE
Special weather statement, May 27, 4:45 PM MDT, 1 hour 36 minutes before
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</html>Special weather statement, May 27, 5:22 PM MDT, 59 minutes before
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</html>The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 7:16 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 19 min |
| May 27, 7:35 PM MDT | Severe Thunderstorm Warning | CYS | Dawes | 55 min |
| May 27, 8:31 PM MDT | Severe Thunderstorm Warning | CYS | Dawes, Sheridan | 29 min |
| May 27, 8:54 PM MDT | Severe Thunderstorm Warning | CYS | Sheridan | 35 min |
| May 27, 11:10 PM MDT | Severe Thunderstorm Warning | CYS | Dawes | 35 min |
| May 28, 5:33 PM MDT | Severe Thunderstorm Warning | CYS | Banner | 27 min |
| May 27, 8:31 PM MDT | Severe Thunderstorm Warning | CYS | Platte | 29 min |
| May 28, 5:02 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 28 min |
| May 28, 5:34 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 26 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 1991Every severe thunderstorm warning in 1991
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.