Alert archive / Wyoming / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 28, NWS Cheyenne, WY

June 6, 1990Goshen County, Laramie County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 6, 1990, 3:03 PM MDT for Goshen County, Laramie County, Wyoming. It was in force for 42 min.

The area

The counties it named.

The facts

Issued
Jun 6, 1990, 3:03 PM MDT (21:03 UTC)
Expired
Jun 6, 1990, 3:45 PM MDT
In force
42 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

Counties Goshen County, WY, Laramie County, WY

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 9.1 hours before the alert went out and 230 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 12:00Z on 1990-06-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 101 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, Denver, CO at 12:00Z on 1990-06-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.193958Sfc1 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
101 J/kg
Mixed-layer CIN
-396 J/kg
Mixed-layer LCL
1467 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
89 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 KCYS 062106
SVRCYS
WYC015-021-062145-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
303 PM MDT WED JUN 6 1990
 
THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  345 PM MDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN SOUTHEAST WYOMING
          ...SOUTHERN GOSHEN...NORTHERN LARAMIE INCLUDING THE TOWNS
OF TORRINGTON...ALBIN...LAGRANGE AND HAWK SPRINGS...
 
AT 3 PM MDT WEATHER RADAR INDICATED SEVERE THUNDERSTORMS IN NORTHERN
LARAMIE AND SOUTHERN GOSHEN COUNTIES OF SOUTHEAST WYOMING. THE STORMS
WERE MOVE EAST NORTHEAST AT 30 MPH. HAIL UP TO 3/4 OF AN INCH WAS
REPORTED WITH THESE STORMS .
 
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.
 
IF YOU ARE CAUGHT OUTSID:E...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

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, Jun 6, 1:26 PM MDT, 1 hour 37 minutes before
WYZ012-017-062130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
125 PM MDT TUE JUN 5 1990

THUNDERSTORMS HAVE BEGUN TO FORM EARLY THIS AFTERNOON OVER THE LARAMIE
MOUNTAINS OF SOUTHEAST WYOMING.  CONDITIONS WILL BE RIPE FOR STRONG
THUNDERSTORMS THIS AFTERNOON AND EVENING OVER SOUTHEAST WYOMING EAST
OF THE LARAMIE MOUNTAINS INCLUDING LARAMIE...PLATTE AND GOSHEN COUNTIES.
THE STORMS WILL HAVE THE POTENTIAL FOR HAIL...STRONG GUSTY WINDS...HEAVY
RAIN AND DANGEROUS LIGHTNING.

PEOPLE IN SOUTHEAST WYOMING SHOULD WATCH THE SKY AND MONITOR
LOCAL BROADCASTS FOR NEW DEVELOPMENTS.

SCOTT
Special weather statement, Jun 6, 2:19 PM MDT, 44 minutes before
WYZ012-017-062230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
215 PM MDT WED JUN 6 1990

...TORNADO WATCH FOR SOUTHEAST WYOMING...

STRONG THUNDERSTORMS HAVE DEVELOPED IN NORTHERN LARAMIE COUNTY ABOUT
20 MILES NORTH OF CHEYENNE.  THESE STORMS MOST LIKELY CONTAIN HAIL
AND STRONG GUSTY WINDS.  THE STORMS HAVE BEEN MOVING EAST AT ABOUT
30 MILES AN HOUR.

THUNDERSTORMS WILL CONTINUE TO DEVELOP OVER SOUTHEAST WYOMING
THIS AFTERNOON.  SOME STORMS MAY BE SEVERE WITH LARGE HAIL...STRONG
WINDS AND POSSIBLY TORNADOES.

PEOPLE IN SOUTHEAST WYOMING SHOULD WATCH THE SKY AND STAY TUNED TO
LOCAL BROADCASTS FOR NEW DEVELOPMENTS.

SCOTT

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 6, 4:49 PM MDTSevere Thunderstorm WarningCYSGoshen, Platte41 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 1990Every severe thunderstorm warning in 1990

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.