Alert archive / Nebraska / Tornado Warnings in 1991

Tornado Warning 12, NWS Cheyenne, WY

May 30, 1991Sioux County, Nebraska

NWS Cheyenne, WY issued this tornado warning at May 30, 1991, 7:02 PM MDT for Sioux County, Nebraska. It was in force for 28 min.

The area

The counties it named.

The facts

Issued: May 30, 1991, 7:02 PM MDT (01:02 UTC)
Expired: May 30, 1991, 7:30 PM MDT
In force: 28 min
Issued by: NWS Cheyenne, WY
Area: Whole counties

County Sioux County, NE

The nearest sounding before it

Rapid City, SD (KRAP), launched 00:00Z, 1.0 hours before the alert went out and 190 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1500 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 1481 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 171 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 8.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBFF 310102
TORBFF
NEC165-310130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING 
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
702 PM MDT THU MAY 30 1991

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 730 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTY

   IN THE PANHANDLE OF NEBRASKA
      SOUTHEAST SIOUX

AT 700 PM MDT...RADAR INDICATED A TORNADO 8 MILES NORTHWEST OF
SCOTTSBLUFF...NEAR THE KSTF-TV TRANSMITTER TOWER ON HIGHWAY 71.
THE STORM WAS MOVING NORTHEAST AT 20 MPH.

DO NOT TRY TO OUTRUN A TORNADO IN A CAR.  CARS ARE EASILY TOSSED
AROUND BY TORNADOES.  IF YOU ARE CAUGHT IN THE PATH OF A TORNADO...
LEAVE THE CAR AND GO TO A REINFORCED BUILDING.  IF NO STRUCTURE IS
NEARBY...TAKE SHELTER IN A DITCH OR LOW SPOT AWAY FROM THE VEHICLE.

LARGE HAIL...DANGEROUS LIGHTNING AND VERY HEAVY RAIN ARE LIKELY WITH
THIS STORM...IN ADDITION TO THE THREAT OF TORNADOES.

TAKE COVER NOW.

PFEIFFER

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, May 30, 3:01 PM MDT, 4 hours 1 minute before

WYZ006-012-310000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
300 PM MDT THU MAY 30 1991

...A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR NORTHEAST WYOMING
FOR THIS AFTERNOON AND EVENING...

THUNDERSTORMS HAVE BEGUN TO DEVELOP IN EASTERN WYOMING AGAIN.  THE
STRONGEST STORMS ARE EXPECTED TO FORM OVER NORTHEAST SECTIONS OF THE
STATE.  AS A RESULT...THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE
THUNDERSTORM WATCH VALID FROM 330 PM THIS AFTERNOON UNTIL 900 PM THIS
EVENING.

THE WATCH AREA INCLUDES CROOK...WESTON...NIOBRARA...EASTERN CAMPBELL
...AND EASTERN CONVERSE COUNTIES.

PERSONS IN THOSE COUNTIES ARE ADVISED TO KEEP ABREAST OF THE LATEST
WEATHER DEVELOPMENTS.
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CGB

Special weather statement, May 30, 3:26 PM MDT, 3 hours 36 minutes before

WYZ012-302200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
325 PM MDT THU MAY 30 1991

...A STRONG THUNDERSTORM HAS DEVELOPED IN FAR WESTERN GOSHEN COUNTY
IN SOUTHEAST WYOMING AT 320 PM...

THE STORM WAS LOCATED ABOUT 18 MILES SOUTHEAST OF WHEATLAND...AND
MOVING NORTH NORTHEAST AT ABOUT 25 MILES AN HOUR INTO FAR WESTERN
GOSHEN COUNTY.

PEOPLE IN WESTERN GOSHEN COUNTY SHOULD REMAIN ALERT TO THIS STORM...
AS IT LIKELY IS PRODUCING SMALL HAIL...BRIEF HEAVY RAIN...AND GUSTY
WINDS.  GO TO SAFE PLACE SUCH AS YOUR BASEMENT AND WAIT FOR THE
STORM TO PASS.

JAD

Special weather statement, May 30, 4:37 PM MDT, 2 hours 25 minutes before

WYZ006-012-017-310000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
435 PM MDT THU MAY 30 1991

...A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR EXTREME EASTERN
WYOMING TIL 900 PM...

A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR EXTREME SOUTHEAST
WYOMING TIL 900 PM THIS EVENING. THIS IS IN ADDITION TO THE PREVIOUSLY
ISSUED SEVERE THUNDERSTORM WATCH FOR EXTREME NORTHEAST WYOMING. SOME
CITIES THAT ARE NOW WITHIN WITHER SEVERE THUNDERSTORM WATCHES ARE...
PINE BLUFFS...WHEATLAND...TORRINGTON...GILLETTE...SUNDANCE...
NEWCASTLE...DOUGLAS AND LUSK.

A SEVERE THUNDERSTORM WATCH MEANS THAT SEVERE THUNDERSTORMS ARE
POSSIBLE IN THAT AREA. ALREADY THIS AFTERNOON...SEVERAL TORNADOES HAVE
BEEN SPOTTED IN EAST CENTRAL WYOMING ALONG WITH LARGE HAIL.

AT 430 PM...THUNDERSTORMS CONTINUED TO DEVELOP OVER THE EAST PART OF
WYOMING...WITH THE MOST INTENSE STORMS STILL IN EAST CENTRAL WYOMING.
ALL OF THE STORMS WERE MOVING NOeRTHEAST AT 30 MILES AN HOUR.

PEOPLE IN EXTREME EASTERN WYOMING SHOULD BE ALERT TO THE POSSBILITY
OF SEVERE THUNDERSTORMS DURING THE EVENING HOURS. IF A STORM
APPROACHES...MOVE TO A SAFE SHELTER RIGHT AWAY.
WEILAND

Special weather statement, May 30, 5:38 PM MDT, 1 hour 24 minutes before

WYZ006-012-017-310030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
530 PM MDT THU MAY 30 1991

...THE SEVERE THUNDERSTORM WATCH HAS BEEN CANCELLED FOR THE WEST PARTS
OF WESTON AND CROOK COUNTIES AND THE EAST PARTS OF CONVERSE AND
CAMPBELL COUNTIES...

THE SEVERE THUNDERSTORM WATCH HAS BEEN CANCELLED FOR THE WEST PARTS OF
WESTON AND CROOK COUNTIES AND THE EAST PARTS OF CAMPBELL AND CONVERSE
COUNTIES. SEVERE THUNDERSTORM WATCHES REMAIN IN EFFECT TIL 900 PM FOR
THE REST OF EXTREME EASTERN WYOMING. SOME CITIES WHERE THE WATCH IN
NO LONGER IN EFFECT FOR ARE GILLETTE AND DOUGLAS.

THUNDERSTORMS CONTINUE TO DEVELOP IN EXTREME EASTERN WYOMING LATE
THURSDAY AFTERNOON. SEVERAL SEVERE THUNDERSTORMS WERE LOCATED FROM
SOUTH CENTRAL TO EAST CENTRAL LARAMIE COUNTY.

PEOPLE IN EXTREME EASTERN WYOMING TIL 900 PM SHOULD BE AWARE OF THE
POSSBILITY OF SEVERE THUNDERSTORMS. IF A STORM APPROACHES...MOVE TO A
SAFE SHELTER RIGHT A4WAY.
WEILAND

Special weather statement, May 30, 6:20 PM MDT, 42 minutes before

WYZ012-310200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
620 PM MDT THU MAY 30 1991

...A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR EXTREME EASTERN
WYOMING UNTIL 900 PM MDT THIS THURSDAY EVENING...

AT 610 PM MDT...NATIONAL WEATHER SERVICE RADAR INDICATED A STRONG
THUNDERSTORM 29 MILES SOUTH OF TORRINGTON NEAR THE TOWN OF LAGRANGE.
THE STORM WAS MOVING EAST AT 25 MILES AN HOUR.

THIS THUNDERSTORM WAS DUMPING PEA TO MARBLE SIZED HAIL...BRIEF HEAVY
RAIN...FREQUENT LIGHTNING...AND STRONG WINDS.  THE STORM WILL BE MOVING
EAST OUT OF THE STATE BY 645 PM MDT.  IF YOU ARE CAUGHT IN THE PATH OF
THIS STORM...MOVE TO A SAFE SHELTER IMMEDIATELY.

PEOPLE IN EXTREME EAnSTERN WYOMING ARE REMINDED THAT A SEVERE
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT THIS THURSDAY
EVENING.
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VIRGILLITO

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 6:48 PM MDT	Tornado Warning	CYS	Kimball	27 min
May 30, 10:07 PM MDT	Severe Thunderstorm Warning	CYS	Garden	38 min
May 30, 11:18 PM MDT	Severe Thunderstorm Warning	CYS	Garden	27 min
May 31, 1:12 AM MDT	Severe Thunderstorm Warning	CYS	Sheridan	33 min
May 31, 1:44 AM MDT	Tornado Warning	CYS	Sheridan	31 min
May 31, 2:20 AM MDT	Severe Thunderstorm Warning	CYS	Sheridan	25 min
May 31, 3:48 AM MDT	Severe Thunderstorm Warning	CYS	Garden	27 min

Nearby

Tornado Warnings in Nebraska, 1991 Every tornado warning in 1991 Tornadoes 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.