Alert archive / Wyoming / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 81, NWS Cheyenne, WY

July 24, 1990Laramie County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 24, 1990, 2:58 PM MDT for Laramie County, Wyoming. It was in force for 62 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
Jul 24, 1990, 2:58 PM MDT (20:58 UTC)
Expired
Jul 24, 1990, 4:00 PM MDT
In force
62 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Laramie County, WY

The radar

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

What was reported inside it

TimeReportWhereRemark
Jul 24, 3:35 PM MDTThunderstorm Wind 50Laramie, 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 12:00Z, 9.0 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 12:00Z on 1990-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1990-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2660 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
39 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 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 24, 1:02 PM MDT, 1 hour 56 minutes before
WYZ007-008-009-013-014-242000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
100 PM MDT TUE JUL 24 1990

RADAR AND LIGHTNING DETECTION EQUIPMENT SHOWED SCATTERED THUNDERSTORMS
OVER SOUTHWEST WYOMING AT 1245 PM.  MOST OF THE STORMS WERE BETWEEN
EVANSTON AND KEMMERER WITH ANOTHER STRONG CELL FURTHER NORTH...JUST
NORTHWEST OF PINEDALE.  ALL OF THE THUNDERSTORMS WERE MOVING NORTHEAST
AROUND 15 MILES AN HOUR.

THUNDERSTORMS WILL CONTINUE OVER SOUTHWEST WYOMING THIS AFTERNOON AND
EVENING.  A FEW OF THE STORMS WILL PRODUCE BRIEF HEAVY RAIN...SMALL
HAIL AND WIND GUSTS TO 50 MILES AN HOUR AS WELL AS DEADLY LIGHTNING.

SCATTERED THUNDERSTORMS...A FEW POSSIBLY STRONG...WILL ALSOh BE
DEVELOPING OVER SOUTHEAST WYOMING THROUGH THE EVENING.

PEOPLE IN SOUTHERN WYOMING SHOULD BE ALERT TO DEVELOPING THUNDERSTORMS
THIS AFTERNOON AND EVENING.  SHOULD A STORM APPROACH YOUR AREA...SEEK
A SAFE PLACE IMMEDIATELY.

HATTEN
Special weather statement, Jul 24, 2:09 PM MDT, 49 minutes before
WYZ007-008-009-013-014-015-016-017-242100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
205 PM MDT TUE JUL 24 1990

THUNDERSTORMS CONTINUE TO DEVELOP OVER THE WEST AND SOUTH PART OF
WYOMING EARLY THIS AFTERNOON. AT 155 PM MDT THE STRONGEST STORMS IN THE
SOUTH AND WEST WERE LOCATED BETWEEN EVANSTON AND AFTON...WEST OF ROCK
SPRINGS AND ABOUT 20 MILES NORTHWEST OF CHEYENNE. ALL OF THE STORMS
WERE MOVING TO THE EAST OR NORTHEAST AT 20 MILES AN HOUR.

THE STORMS WILL PRODUCE STRONG AND GUSTY WINDS TO 50 MILES AN HOUR...
HAIL...DANGEROUS LIGHTNING AND BRIEF HEAVY RAIN.

THUNDERSTORMS WILL BE LIKELY OVER MUCH OF WYOMING THROUGH EARLY
TONIGHT. PEOPLE IN THE STATE SHOULD BE A1LERT TO THE POSSIBILITY OF
THUNDERSTORMS AND TAKE IMMEDIATE COVER AS LIGHTNING CAN BE DEADLY.
WEILAND

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 24, 3:36 PM MDTSevere Thunderstorm WarningCYSLaramie49 min
Jul 24, 4:06 PM MDTTornado WarningCYSSweetwater39 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.