Alert archive / Wyoming / Tornado Warnings in 1991

Tornado Warning 14, NWS Cheyenne, WY

June 1, 1991Laramie County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Jun 1, 1991, 6:08 PM MDT for Laramie County, Wyoming. It was in force for 52 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jun 1, 1991, 6:08 PM MDT (00:08 UTC)
Expired
Jun 1, 1991, 7:00 PM MDT
In force
52 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Laramie County, WY

What was reported inside it

TimeReportWhereRemark
Jun 1, 6:20 PM MDTHail 0.75Laramie, WY

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 0.1 hours before the alert went out and 202 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, Denver, CO at 00:00Z on 1991-06-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 1991-06-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -342 square meters per square second.193958Sfc1 km3 km6 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1289 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
-342 m²/s²
0-3 km storm-relative helicity
-213 m²/s²
Significant tornado parameter
0.0
Supercell composite
-4.4

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 1, 2:27 PM MDT, 3 hours 41 minutes before
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Special weather statement, Jun 1, 3:50 PM MDT, 2 hours 18 minutes before
WYZ013-014-012245-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
349 PM MDT SAT JUN 1 1991

SCATTERED THUNDERSTORMS CONTINUED OVER SOUTHWEST WYOMING AT 340 PM.
A FEW OF THE STORMS WERE LIKELY PRODUCING HEAVY RAIN AND SMALL HAIL
...AS WELL AS DEADLY LIGHTNING.  SINCE THE THUNDERSTORMS WERE MOVING
NORTHWEST AT ONLY 15 MILES AN HOUR...SOME FLOODING OF LOW LYING AREAS
MAY ALSO OCCUR.

THUNDERSTORMS WILL CONTINUE OVER SOUTHWEST WTYOMING THROUGH THE EVENING
HOURS.  PEOPLE IN SOUTHWEST WYOMING SHOULD KEEP AN EYE ON THE SKY THIS
AFTERNOON AND EVENING.  SHOULD A THUNDERSTORM APPROACH YOUR AREA...
SEEK A SAFE PLACE IMMEDIATELY...INDOORS IF POSSIBLE.

HATTEN
Special weather statement, Jun 1, 5:23 PM MDT, 45 minutes before
WYZ015-016-017-020000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
523 PM MDT SAT JUN 1 1991

...SOME STRONG THUNDERSTORMS WERE STARTING TO DEVELOP OVER SOUTHEAST
WYOMING AT 520 PM...

SCATTERED THUNDERSTORMS WERE DEVELOPING AT 520 PM OVER THE SOUTHERN
PARTS OF ALBANY AND LARAMIE COUNTIES.  THE STRONGEST STORM WAS LOCATED
NEAR BURNS...OR ABOUT 25 MILES EAST OF CHEYENNE.  OTHER STORMS WERE
BECOMING QUITE STRONG OVER THE EXTREME SOUTHERN END OF THE LARAMIE
MOUNTAIN RANGE...ABOUT 20 MILES SOUTHEAST OF LARAMIE.

THE STORMS WERE MOVING TO THE NORTHWEST AT ABOUT 25 MILES AN HOUR.

PEOPLE IN LARAMIE AND ALBANY COUNTIES SHOULD KEEP AN EYE ON THE SKY
THIS EVENING.  THESE STORMS WILL LIKELY PRODUCE HAIL...GUSTY WINDS...
AND LOCALLY HEAVY RAINS.  A FLASH FLOOD WATCH REMAINS IN EFFECT FOR
THE FOOTHILLS OF THE LARAMIE AND SNOWY RANGES OVERNIGHT.

JAD
Special weather statement, Jun 1, 5:34 PM MDT, 34 minutes before
WYZ013-014-020015-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
533 PM MDT SAT JUN 1 1991

...THUNDERSTORMS WITH HEAVY RAIN WERE MOVING THROUGH SOUTHWEST
WYOMING AT 525 PM...

A BAND OF THUNDERSTORMS WAS LOCATED ACROSS SOUTHWEST WYOMING AT 525
PM.  THE BAND EXTENDED ACROSS MUCH OF CENTRAL AND SOUTHERN SWEETWATER
COUNTY...AND ON WEST INTO UINTA AND SOUTHERN LINCOLN COUNTIES.

THE MAIN WEATHER HAZARD WITH THESE STORMS HAS BEEN SOME HEAVY RAIN
AND DEADALY LIGHTNING.  PEA TO MARBLE SIZE HAIL WAS REPORTED AT 520 PM
AT COKEVILLE...WHICH IS 30 MILES NORTHWEST OF KEMMERER.

PEOPLE IN SOUTHWEST WYOMING SHOULD REMAIN ALERT TO THESE STORMS.  THEY
WILL CONTINUE TO PRODUCE SMALL HAIL AND HEAVY RAINS THROUGH THIS
EVENING.  SOME SMALL STREAMS MAY BRIEFLY OVERFLOW THEIR BANKS...AND
MOTORISTS SHOULD BE ON THE LOOKOUT FOR WATER ON ROADS.

JAD
Special weather statement, Jun 1, 5:47 PM MDT, 21 minutes before
NEZ001-005-011-020030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
545 PM MDT SAT JUN 1 1991

...STRONG THUNDERSTORM IN THE SOUTHWESR NEBRASKA PANHANDLE...

AT 540 PM MDT...RADAR INDICATED A STRONG THUNDERSTORM 5 MILES NORTHWEST
OF KIMBALL OR 35 MILES NORTHWEST OF SIDNEY NEBRASKA MOVING TO THE
NORTHWEST AT 25 MPH.  OTHER THUNDERSHOWERS WERE SCATTERED ACROSS BANNER
AND SCOTTS BLUFF COUNTIES OF THE CENTRAL AND SOUTHERN NEBRASKA
PANHANDLE.

BRIEF HEAVY RAIN...STRONG GUSTY WIND AND SMALL HAIL ARE POSSIBLE WITH
THESE STORMS AS THEY MOVE NORTHWEST ACROSS KIMBALL...BANNER AND SCOTTS
BLUFF COUNTIES UNTIL 630 PM MDT.
KIRK

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 1, 7:00 PM MDTSevere Thunderstorm WarningCYSLaramie60 min
Jun 1, 7:50 PM MDTFlash Flood WarningCYSAlbany, Laramie4 hr
Jun 1, 10:50 PM MDTFlash Flood WarningCYSGoshen, Laramie, Platte2 hr
Jun 2, 5:33 PM MDTFlash Flood WarningCYSSweetwater4 hr

Nearby

Tornado Warnings in Wyoming, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.