Alert archive / Nebraska / Tornado Warnings in 1991

Tornado Warning 39, NWS Cheyenne, WY

August 7, 1991Sheridan County, Nebraska

NWS Cheyenne, WY issued this tornado warning at Aug 7, 1991, 5:30 PM MDT for Sheridan County, Nebraska. It was in force for 30 min.

The area

The counties it named.

The facts

Issued
Aug 7, 1991, 5:30 PM MDT (23:30 UTC)
Expired
Aug 7, 1991, 6:00 PM MDT
In force
30 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Sheridan County, NE

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 11.5 hours before the alert went out and 178 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.

Skew-T log-pSkew-T log-p diagram, Rapid City, SD at 12:00Z on 1991-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 12:00Z on 1991-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
5 J/kg
Mixed-layer CIN
-292 J/kg
Mixed-layer LCL
865 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
60 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KBFF 072330
TORBFF
NEC161-080000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING 
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
530 PM MDT WED AUG 7 1991

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 600 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTY

   IN THE PANHANDLE OF NEBRASKA
      CENTRAL SHERIDAN

AT 527 PM MDT...RADAR INDICATED A TORNADO 5 MILES SOUTHWEST OF
RUSHVILLE...MOVING SOUTHEAST AT 10 MPH.

TAKE SHELTER IN A BASEMENT IF AVAILABLE.  OTHERWISE GO TO A SMALL
INTERIOR ROOM ON THE LOWEST FLOOR.  STAY AWAY FROM WINDOWS.  ABANDON
CARS AND MOBILE HOMES.

GIVE REPORTS OF SEVERE WEATHER OR DAMAGE TO A LAW ENFORCEMENT AGENCY
FOR RELAY TO TH,E NATIONAL WEATHER SERVICE.

SEVERE THUNDERSTORM WARNING CONTINUES UNTIL 6 PM FOR NORTH BOX BUTTE
AND SOUTHERN DAWES COUNTIES.

PEEK

What forecasters said that day

The local office's own words before this tornado 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, Aug 7, 3:21 PM MDT, 2 hours 9 minutes before
NEZ002-0702230

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE VALENTINE NE
ISSUED BY SCOTTSBLUFF NE
320 PM MDT WED AUG 7 1991

...STRONG THUNDERSTORM OVER SOUTHEAST CHERRY COUNTY...

AT 318 PM MDT...RADAR INDICATED A STRONG THUNDERSTORM OVER SOUTHEAST
CHERRY COUNTY 40 MILES OUTHEAST OF VALENTINE NEBRASKA.  THE STORM WAS
MOVING TO THE NORTHEAST AT 20 MPH.

HEAVY RAIN...STRONG GUSTY WIND...SMALL HAIL AND DEADLY LIGHTNING ARE
POSSIBLE WITH THIS STORM OVER SOUTHEAST CHERRY COUNTY UNTIL 430 PM MDT.
EMANUEL
Special weather statement, Aug 7, 3:22 PM MDT, 2 hours 8 minutes before
NEZ002-0702230

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE VALENTINE NE
ISSUED BY SCOTTSBLUFF NE
320 PM MDT WED AUG 7 1991

...STRONG THUNDERSTORM OVER SOUTHEAST CHERRY COUNTY...

AT 318 PM MDT...RADAR INDICATED A STRONG THUNDERSTORM OVER SOUTHEAST
CHERRY COUNTY 40 MILES OUTHEAST OF VALENTINE NEBRASKA.  THE STORM WAS
MOVING TO THE NORTHEAST AT 20 MPH.

HEAVY RAIN...STRONG GUSTY WIND...SMALL HAIL AND DEADLY LIGHTNING ARE
POSSIBLE WITH THIHS STORM OVER SOUTHEAST CHERRY COUNTY UNTIL 430 PM MDT.
EMANUEL
Special weather statement, Aug 7, 3:33 PM MDT, 1 hour 57 minutes before
NEZ001-005-011-072230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
333 PM MDT WED AUG 7 1991

...STRONG THUNDERSTORMS OVER THE NORTH NEBRASKA PANHANDLE...

AT 331 PM MDT...STRONG THUNDERSTORMS WERE SHOWN BY RADAR 50 MILES WEST
...20 MILES EAST AND 35 MILES SOUTHWEST OF CHADRON.  THE STORMS WERE
MOVING EAST AT 10 MPH.

BRIEF HEAVY RAIN...STRONG GUSTY WIND...SMALL HAIL AND DEADLY LIGHTNING
ARE POSSIBLE IN NORTHERN SIOUX...WESYTERN DAWES AND NORTHERN SHERIDAN
COUNTIES UNTIL 430 PM MDT.
PEEK
Special weather statement, Aug 7, 4:21 PM MDT, 1 hour 9 minutes before
NEZ001-005-011-072320-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
421 PM MDT WED AUG 7 1991

...STRONG THUNDERSTORMS OVER THE NORTH NEBRASKA PANHANDLE...

AT 419 PM MDT...STRONG THUNDERSTORMS WERE SHOWN BY RADAR 30 MILES
SOUTHWEST OF CHADRON...OR 7 MILES SOUTHWEST OF CRAWFORD.  ANOTHER VERY
STRONG STORM WAS LOCATED FROM 20 MILES NORTHEAST TO 15 MILES SOUTHEAST
OF CHADRON.  MOVEMENT OF ALL ACTIVITY WAS TO THE EAST AT 10 MPH.

BRIEF HEAVY RAIN...STRONG GUSTY WIND...SMALL HAIL AND DEADLY LIGHTNING
ARE POSSIBLE IN NORTHERN AND CENTRAL SIOUX...WESTERN DAWES AND NORTHERN
SHERIDAN COUNTIES AT LEAST UNTIL 520 PM MDT.
PEEK

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 6, 6:38 PM MDTSevere Thunderstorm WarningCYSSioux67 min
Aug 6, 7:22 PM MDTSevere Thunderstorm WarningCYSBox Butte38 min
Aug 6, 8:05 PM MDTSevere Thunderstorm WarningCYSSheridan25 min
Aug 6, 9:30 PM MDTSevere Thunderstorm WarningCYSBox Butte30 min
Aug 6, 10:03 PM MDTSevere Thunderstorm WarningCYSMorrill27 min
Aug 7, 4:55 PM MDTSevere Thunderstorm WarningCYSDawes51 min
Aug 7, 5:19 PM MDTSevere Thunderstorm WarningCYSBox Butte27 min

Nearby

Tornado Warnings in Nebraska, 1991Every tornado warning in 1991Tornadoes 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; the sounding from the Mesonet's radiosonde archive.