Alert archive / Wyoming / Severe Thunderstorm Warnings in 1995

Severe Thunderstorm Warning 39, NWS Cheyenne, WY

July 12, 1995Big Horn County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 12, 1995, 2:04 PM MDT for Big Horn County, Wyoming. It was in force for 56 min.

The area

The counties it named.

The facts

Issued
Jul 12, 1995, 2:04 PM MDT (20:04 UTC)
Expired
Jul 12, 1995, 3:00 PM MDT
In force
56 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Big Horn County, WY

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 8.1 hours before the alert went out and 165 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, Riverton, WY at 12:00Z on 1995-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 32 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 12:00Z on 1995-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.19395878Sfc1 km3 km6 km9 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
32 J/kg
Mixed-layer CIN
-431 J/kg
Mixed-layer LCL
2177 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
134 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 KSHR 122004 RRA
SVRSHR
WYC003-122100-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SHERIDAN WY
204 PM MDT WED JUL 12 1995
 
THE NATIONAL WEATHER SERVICE IN SHERIDAN HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  300 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTH CENTRAL WYOMING
 
   ...BIG HORN COUNTY
 
THIS INCLUDES THE TOWN OF GREYBULL AND THE SURROUNDING
COMMUNITIES.
 
AT 2 PM MDT...A WIND GUST OF 62 MILES PER HOUR WAS
REPORTED AT THE GREYBULL AIRPORT. RADAR INDICATED A
SEVERE THUNDERSTORM LOCATED JUST TO THE WEST OF
GREYBULL AT THAT TIME.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
 
 
LOCKHART
WCJIN-WYNW
&
NNNN

What forecasters said that day

The local office's own words before this severe thunderstorm 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, Jul 12, 1:45 PM MDT, 19 minutes before
WYZ016-018-021-022>025-122045-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
145 PM MDT WED JUL 12 1995

...STRONG THUNDERSTORM WINDS CAN BE EXPECTED IN SOUTHWEST WYOMING...

THUNDERSTORMS ARE MOVING OUT OF UTAH INTO SOUTHWEST WYOMING THIS
AFTERNOON.  SOME OF THESE STORMS HAVE BECOME RATHER STRONG AS THEY MOVE
NORTHEAST AT ABOUT 30 MPH.  THE MAIN THREAT FROM THESE STORMS THIS
AFTERNOON WILL BE STRONG WINDS AS HIGH AS 50 TO 55 MPH.

PEOPLE IN SOUTHWEST WYOMING SHOULD BE PREPARED FOR STRONG WINDS AS
THUNDERSTORMS APPROACH.  SECURE LOOSE ITEMS WHICH COULD BLOW AWAY AND
BE PREPARED TO SEEK SHELTER IF A STORM APPROACHES.

WCJIN-WYSW
JMH
Special weather statement, Jul 12, 1:49 PM MDT, 15 minutes before
WYZ016-018-021-022>025-122045-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
145 PM MDT WED JUL 12 1995

...STRONG THUNDERSTORM WINDS CAN BE EXPECTED IN SOUTHWEST WYOMING...

THUNDERSTORMS ARE MOVING OUT OF UTAH INTO SOUTHWEST WYOMING THIS
AFTERNOON.  SOME OF THESE STORMS HAVE BECOME RATHER STRONG AS THEY MOVE
NORTHEAST AT ABOUT 30 MPH.  THE MAIN THREAT FROM THESE STORMS THIS
AFTERNOON WILL BE STRONG WINDS AS HIGH AS 50 TO 55 MPH.

PEOPLE IN SOUTHWEST WYOMING SHOULD BE PREPARED FOR STRONG WINDS AS
THUNDERSTORMS APPROACH.  SECURE LOOSE ITEMS WHICH COULD BLOW AWAY AND
BE PREPARED TO SEEK SHELTER IF A STORM APPROACHES.

WCJIN-WYSW
JMH

Nearby

Severe Thunderstorm Warnings in Wyoming, 1995Every severe thunderstorm warning in 1995

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.