Alert archive / Nebraska / Tornado Warnings in 1991

Tornado Warning 28, NWS Cheyenne, WY

June 18, 1991Cheyenne County, Nebraska

NWS Cheyenne, WY issued this tornado warning at Jun 18, 1991, 5:17 PM MDT for Cheyenne County, Nebraska. It was in force for 28 min.

The area

The counties it named.

The facts

Issued: Jun 18, 1991, 5:17 PM MDT (23:17 UTC)
Expired: Jun 18, 1991, 5:45 PM MDT
In force: 28 min
Issued by: NWS Cheyenne, WY
Area: Whole counties

County Cheyenne County, NE

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 11.3 hours before the alert went out and 151 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2299 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 24 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 182317
TORBFF
NEC033-182345-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING 
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
517 PM MDT TUE JUN 18 1991

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 545 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTY

   IN THE PANHANDLE OF NEBRASKA
      WESTERN CHEYENNE

AT 513 PM MDT...A TORNADO WAS SIGHTED BY A SPOTTER 10 MILES WEST
OF SIDNEY.  THE TORNADO WAS MOVING EAST AT 5 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.

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.

THE SEVERE THUNDERSTORM WARNING EXPIRED FOR NORTHEKRN CHEYENNE...
SOUTHERN MORRILL...EASTERN KIMBALL AND BANNER 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, Jun 18, 2:27 PM MDT, 2 hours 50 minutes before

WYZ012-016-017-182200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
227 PM MDT TUE JUN 18 1991

...INTENSE THUNDERSTORMS ARE DEVELOPING WEST OF THE LARAMIE RANGE...

AT 215 PM MDT THUNDERSTORMS WERE DEVELOPING IN ALBANY COUNTY ABOUT
25 MILES NORTH OF LARAMIE NEAR THE TOWN OF BOSLER. THESE STORMS WERE
MOVING TO THE EAST AT ABOUT 15 MILES AN HOUR AND SHOULD APPROACH
WHEATLAND AND CHUGWATER WYOMING WITHIN THE NEXT HOUR. PEOPLE ALONG
INTERSTATE 25 BETWEEN THESE TWO TOWNS SHOULD ALSO STAY ALERT.

AT THE PRESENT TIME...RADAR IS INDICATING THAT THESES STORMS COULD HAVE
PEA SIZED HAIL AND LOCALLY GUSTY SURFACE WINDS...BUT THEY WERE ALSO
SHOWING SIGNS OF INTENSIFYING AS THEY MOVED EAST.

PEOPLE IN ALBANY AND PLATTE COUNTIES OF WYOMING SHOULD KEEP AN EYE
ON THE SKY AS THESE STORMS MOVE EAST. SHOULD THESE STORMS INTENSIFY
FURTHER YOU SHOULD BE PREPARED TO MOVE TO A PLACE OF SAFETY AS
QUICKLY AS POSSIBLE.
PARKER

Special weather statement, Jun 18, 2:41 PM MDT, 2 hours 36 minutes before

WYZ012-016-017-182230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
240 PM MDT TUE JUN 18 1991

...A TORNADO WATCH UNTIL 9PM MDT FOR SOUTHEAST WYOMING...

A TORNADO WATCH HAS BEEN ISSUED FOR ALBANY...PLATTE...GOSHEN...LARAMIE
SOUTHERN NIOBRARA AND SOUTHERN CONVERSE COUNTIES OF SOUTHEAST WYOMING
UNTIL 9PM MDT.  THIS WATCH INCLUDED THE CITIES OF LARAMIE...CHEYENNE
WHEATLAND...CHUGWATER...TORRINGTON...LUSK...DOUGLAS AND PINE BLUFFS.

SHORTLY AFTER 2PM MDT THIS AFTERNOON...THUNDERSTORMS WERE DEVELOPING
ALONG THE LARAMIE RANGE NORTH OF THE TOWN OF LARAMIE.  THESE STORMS
WERE MOVING EAST AT ABOUT 15 MILES AN HOUR.

PEOPLE IN THE WATCH AREA SHOULD BEGIN TO KEEP AN EYE ON THE SKY AND
BE PREPARED TO MOVE TO A PLACE OF SAFETY SHOULD THREATENING WEATHER
DEVELOP.  BE SURE TO REPORT ANY HAIL...STRONG GUSTY WINDS...FUNNEL
CLOUDS AND/OR TORNADOES TO THE NEAREST LOCAL AUTHORITIES OR TO THE
NATIONAL WEATHER SERVICE.
PARKER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 3:35 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	25 min
Jun 18, 4:00 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne, Morrill	60 min
Jun 18, 4:08 PM MDT	Severe Thunderstorm Warning	CYS	Banner	67 min
Jun 18, 4:18 PM MDT	Tornado Warning	CYS	Cheyenne	27 min
Jun 18, 4:50 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne, Morrill	25 min
Jun 18, 4:50 PM MDT	Severe Thunderstorm Warning	CYS	Kimball	25 min
Jun 18, 5:39 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill	40 min
Jun 18, 5:47 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	32 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.