Alert archive / Wyoming / Tornado Warnings in 1991

Tornado Warning 4, NWS Cheyenne, WY

May 19, 1991Goshen County, Wyoming

NWS Cheyenne, WY issued this tornado warning at May 19, 1991, 6:32 PM MDT for Goshen County, Wyoming. It was in force for 58 min.

The area

The counties it named.

The facts

Issued: May 19, 1991, 6:32 PM MDT (00:32 UTC)
Expired: May 19, 1991, 7:30 PM MDT
In force: 58 min
Issued by: NWS Cheyenne, WY
Area: Whole counties

County Goshen County, WY

The nearest sounding before it

Rapid City, SD (KRAP), launched 00:00Z, 0.5 hours before the alert went out and 251 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: 3278 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1043 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 25 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KCYS 200032
TORCYS
WYC015-200130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING 
NATIONAL WEATHER SERVICE CHEYENNE WY
632 PM MDT SUN MAY 19 1991

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

   IN THE SOUTHEAST PART OF WYOMING
      CENTRAL AND NORTHERN GOSHEN COUNTY

THIS WARNING INCLUDES THE FOLLOWING TOWNS OR CITIES... TORRINGTON...
VETERAN...AND LINGLE.

AT 631 PM MDT RADAR INDICATED A TORNADO LOCATED ABOUT 2 MILES WEST
OF THE TOWN OF VETERAN...OR ABOUT 20 MILES SOUTHWEST OF
TORRINGTON. THE SEVERE THUNDERSTORM PRODUCING THIS TORNADO WAS
MOVING NORTH AT 25 MILES AN HOUR.

THIS IS A DANGEROUS STORM.  ACT QUICKLY.  IF YOU ARE IN THE PATH
OF THIS TORNADO MOVE TO A SHELTER BELOW GROUND IF AVAILABLE.
OTHERWISE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR
POSSIBLE.  AVOID WINDOWS.  ABANDON CARS AND MOBILE HOMES FOR A
REINFORCED BUILDING OR GET INTO A DITCH OR CULVERT.

MENTZER

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 19, 5:03 PM MDT, 1 hour 29 minutes before

WYZ006-011-012-017-200000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
505 PM MDT SUN MAY 19 1991

...A TORNADO WATCH HAS BEEN POSTED FOR NORTHEAST AND EAST CENTRAL
WYOMING UNTIL 11 PM...WITH A SEVERE THUNDERSTORM WATCH UNTIL 11 PM
IN THE FAR SOUTHEAST...

CONDITIONS ONCE AGAIN WERE RIPE FOR SEVERE THUNDERSTORMS OVER MUCH OF
EASTERN WYOMING LATE THIS SUNDAY AFTERNOON INTO THIS EVENING.  HAIL...
STRONG DAMAGING WINDS...AND qPOSSIBLY EVEN A TORNADO COULD OCCUR WITH
A FEW OF THE STORMS.

PEOPLE IN EASTERN WYOMING SHOULD BE ALERT TO THE WEATHER CONDITIONS IN
YOUR AREA...AND MONITOR THIS RADIO STATION FOR FURTHER INFORMATION AND
POSSIBLE WARNINGS.

JAD

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 6:45 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	45 min

Nearby

Tornado Warnings in Wyoming, 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.