Alert archive / Nebraska / Tornado Warnings in 1991
Tornado Warning 40, NWS Cheyenne, WY
NWS Cheyenne, WY issued this tornado warning at Sep 12, 1991, 6:55 PM MDT for Dawes County, Nebraska. It was in force for 35 min.
The area
The counties it named.
The facts
- Issued
- Sep 12, 1991, 6:55 PM MDT (00:55 UTC)
- Expired
- Sep 12, 1991, 7:30 PM MDT
- In force
- 35 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Dawes County, NE
The nearest sounding before it
Rapid City, SD (KRAP), launched 00:00Z, 0.9 hours before the alert went out and 152 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
- 741 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 1046 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KBFF 130055
TORBFF
NEC045-130130-
BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
655 PM MDT THU SEP 12 1991
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 730 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN THE PANHANDLE OF NEBRASKA
DAWES...THE CITY OF CHADRON
AT 654 PM MDT...A TORNADO WAS INDICATED BY RADAR 3 MILES WEST OF
CHADRON NEBRASKA MOVING SOUTHEAST AT 20 MPH.
THIS WARNING INCLUDES THE CITY OF CHADRON AND THE CHADRON STATE
PARK RECREATION AREA.
THIS WARNING REPLACES THE SEVERE THUNDERSTPRM WARNING ISSUED AT
627 PM MDT FOR DAWES COUNTY.
IF YOU ARE CAUGHT OUTSIDE...FIND SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...TAKE SHELTER IN A CULVERT...DITCH OR
LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.
GIVE REPORTS OF SEVERE WEATHER OR DAMAGE TO A LAW ENFORCEMENT AGENCY
FOR RELAY TO THE NATIONAL WEATHER SERVPICE.
PFEIFFERWhat 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, Sep 12, 4:42 PM MDT, 2 hours 13 minutes before
WYZ012-017-122341- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 441 PM MDT THU SEP 12 1991 ...STRONG THUNDERSTORMS CONTINUED IN SOUTHEAST WYOMING... AT 435 PM MDT...STRONG THUNDERSTORMS CONTINUED TO DEVELOP IN THE SOUTHEAST CORNER OF WYOMING. THIS AREA OF THUNDERSTORMS COVERED MOST OF LARAMIE COUNTY AS WELL AS THE SOUTHERN HALF OF PLATTE COUNTY. THESE STORMS WERE MOVING NORTHEAST AT 20 MILES AN HOUR AND SHOULD SPREAD INTO GOSHEN COUNTY BY 500 PM MDT. THE STRONGEST STORMS WERE LOCATED 15 MILES NORTHEAST OF CHEYENNE AND 15 MILES SOUTHEAST OF CHEYENNE. THESE STORMS PRODUCED PEA SIZED HAIL ...WIND GUSTS TO 40 MILES AN HOUR...BRIEF HEAVY RAIN...AND FREQUENT LIGHTNING AS THEY MOVED THROUGH THE CITY OF CHEYENNE AROUND 400 PM. PEOPLE IN THE SOUTHEAST CORNER OF CHEYENNE SHOULD REMAIN ALERT TO THE POSSIBILITY OF STRONG THUNDERSTORMS THROUGH THE EARLY EVENING HOURS. IF A STORM APPROACHES YOUR AREA...MOVE TO At SAFE INDOOR SHELTER. VIRGILLITO
Special weather statement, Sep 12, 4:49 PM MDT, 2 hours 6 minutes before
WYZ012-017-122341- SPECIAL WEATHER STATEMENT...CORRECTED NATIONAL WEATHER SERVICE CHEYENNE WY 448 PM MDT THU SEP 12 1991 ...STRONG THUNDERSTORMS CONTINUED IN SOUTHEAST WYOMING... AT 435 PM MDT...STRONG THUNDERSTORMS CONTINUED TO DEVELOP IN THE SOUTHEAST CORNER OF WYOMING. THIS AREA OF THUNDERSTORMS COVERED MOST OF LARAMIE COUNTY AS WELL AS THE SOUTHERN HALF OF PLATTE COUNTY. THESE STORMS WERE MOVING NORTHEAST AT 20 MILES AN HOUR AND SHOULD SPREAD INTO GOSHEN COUNTY BY 500 PM MDT. THE STRONGEST STORMS WERE LOCATED 15 MILES NORTHEAST OF CHEYENNE AND 15 MILES SOUTHEAST OF CHEYENNE. THESE STORMS PRODUCED PEA SIZED HAIL ...WIND GUSTS TO 40 MILES AN HOUR...BRIEF HEAVY RAIN...AND FREQUENT LIGHTNING AS THEY MOVED THROUGH THE CITY OF CHEYENNE AROUND 400 PM. PEOPLE IN THE SOUTHEAST CORNER OF WYOMING SHOULD REMAIN ALERT TO THE POSSIBILITY OF STRONG THUNDERSTORMS THROUGH THE EARLY EVENING HOURS. IF A STORM APPROACHES YOUR AREA...MOVE TO A SAFE INDOOR SHELTER. CORRECTED FOR WORDING LAST PARAGRAPH VIRGILLITO
Special weather statement, Sep 12, 5:17 PM MDT, 1 hour 38 minutes before
WYZ012-017-130015- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 515 PM MDT THU SEP 12 1991 ...THUNDERSTORMS CONTINUED IN SOUTHEAST WYOMING... AT 510 PM MDT...SCATTERED THUNDERSTORMS WERE NOTED IN PORTIONS OF SOUTHEAST WYOMING. SHOWERS AND THUNDERSTORMS WERE NOTED IN CENTRAL AND EASTERN LARAMIE COUNTY AS WELL AS THE SOUTHERN PORTIONS OF GOSHEN AND PLATTE COUNTIES. THE STORMS WERE MOVING NORTHEAST AT 20 MILES AN HOUR. THE STRONGEST STORM WAS LOCATED 30 MILES NORTHEAST OF CHEYENNE. THIS STORM COULD PRODUCE BRIEF HEAVY RAIN...SMALL HAIL AND STRONG GUSTY WINDS AS IT MOVES TO THE EXTREME EASTERN PORTION OF THE LARAMIE COUNTY. PEOPLE IN THE SOUTHEAST CORNER OF WYOMING SHOULD REMAIN ALERT TO THE POSSIBILITY OF STRONG THUNDERSTORMS THROUGH THE EARLY EVENING HOURS. IF A STORM APPROACHES YOUR AREA...MOVE TO A SAFE INDOOR SHELTER. SIGLER
Special weather statement, Sep 12, 6:14 PM MDT, 41 minutes before
WYZ012-017-130130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 610 PM MDT THU SEP 12 1991 ...STRONG THUNDERSTORMS CONTINUE OVER EXTREME SOUTHEAST WYOMING... AT 600 PM...SEVERAL STORNG THUNDERSTORMS REMAINED OVER THE EXTREME SOUTHEAST CORNER OF WYOMING. AT THAT TIME THE STRONG STORMS WERE LOCATED FROM 5 MILES SOUTH OF PINE BLUFFS TO 25 MILES NORTH OF PINE BLUFFS. THAT AREA IS ABOUT 40 MILES EAST OF CHEYENNE. AS A STORM MOVED THROUGH LA GRANGE...WHICH IS 29 MILES SOUTH OF TORRINGTON...MODERATE RAIN FELL. ALL OF THE STORMS WERE MOVING TO THE NORTHEAST AT 20 MILES AN HOUR...WITH THE STRONG STORMS EXITING WYOMING BY 645 PM. UNTIL THAT TIME THE STORMS WILL PRODUCE HEAVY RAIN...SMALL HAIL AND WIND GUSTS TO 40 MILES AN HOUR. PEOPLE IN THE EXTREME SOUTHEAST CORNER OF WYOMING SHOULD REMAIN ALERT TO THE POSSIBILITY OF STRONG THUNDERSTORMS THROUGH THE EARLY EVENING HOURS. IF A STORM APPROACHES...MOVE INDOORS TO A SAFE SHELTER. WEILAND
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 12, 6:27 PM MDT | Severe Thunderstorm Warning | CYS | Dawes | 63 min |
| Sep 12, 7:29 PM MDT | Severe Thunderstorm Warning | CYS | Dawes | 26 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.