Alert archive / Wyoming / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 9, NWS Cheyenne, WY

May 22, 1996Laramie County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at May 22, 1996, 2:18 PM MDT for Laramie County, Wyoming. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 22, 1996, 2:18 PM MDT (20:18 UTC)
Expired
May 22, 1996, 3:00 PM MDT
In force
42 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 20 km from the middle of the area, began a volume at 20:20 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 8.3 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 1996-05-22Temperature 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 1996-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -11 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1706 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
-11 m²/s²
0-3 km storm-relative helicity
73 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 222028 COR
SVRCYS
WYC021-222100-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING...CORRECTION
NATIONAL WEATHER SERVICE CHEYENNE WY
218 PM MDT WED MAY 22 1996

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  300 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTHEAST WYOMING

   ...EASTERN LARAMIE COUNTY

AT 215 PM MDT DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM IN CENTRAL
LARAMIE COUNTY 15 MILES NORTHEAST OF CHEYENNE. THE STORM WAS MOVING EAST
AT 20 MPH AND WILL PASS NEAR BURNS BY 230 PM AND NEAR ALBIN AROUND 245 PM.


DAMAGING WINDS AND LARGE HAIL ARE LIKELY.  GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS!

CPORRECTED LOCATION OF STORM IN FIRST SENTENCE

HARRISON

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, May 22, 10:08 AM MDT, 4 hours 10 minutes before
WYZ059>070-NEZ001>03-019>021-054-055-192300-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
1007 AM MDT TUE MAY 21 1996

THE SEVERE WEATHER POTENTIAL IN THE COUNTY WARNING AREA OF THE CHEYENNE
NATIONAL WEATHER SERVICE OFFICE IS MODERATE THIS AFTERNOON AND EVENING.

SPOTTER ACTIVATION MAY BE NECESSARY.

DISCUSSION...A DEVELOPING SPRING STORM SYSTEM OVER THE WEST WAS
 GIVING A SOUTHWEST FLOW ALOFT OVER THE AREA WITH INCREASING
 MOISTURE.  AT THE SURFACE...A LOW PRESSURE SYSTEM WILL DEVELOP INTO
 EAST CENTRAL COLORADO AND NORTHWEST KANSAS IN THE AFTERNOON PROVIDING
 A SOUTHTEAST FLOW INTO THE NEBRASKA PANHANDLE AND SOUTHEAST WYOMING.
 THE AIRMASS WILL BECOME UNSTABLE WITH A SLIGHT RISK FOR SEVERE
 THUNDERSTORMS EXPECTED LATER THIS AFTERNOON AND THIS EVENING.

THIS OUTLOOK IS FOR THE FOLLOWING COUNTIES IN SOUTHEAST WYOMING AND
THE NEBRASKA PANHANDLE:
>
WY...ALBANY...CONVERSE...GOSHEN...LARAMIE...NIOBRARA...PLATTE.

NE..@.BANNER   BOX BUTTE   CHEYENNE   DAWES   KIMBALL   MORRILL   SIOUX
     SCOTTS BLUFF

WCJIN-WYSE-WYNE

PAL
Special weather statement, May 22, 1:23 PM MDT, 55 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-222030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
122 PM MDT TUE MAY 22 1996

AT 120 PM...DOPPLER RADAR IN CHEYENNE INDICATED AN AREA OF SHOWERS AND
THUNDERSTORMS DEVELOPING OVER SOUTHEAST WYOMING INTO THE NEBRASKA
PANHANDLE.  THE STRONGEST STORM WAS LOCATED 4 MILES NORTHWEST OF
CHUGWATER IN SOUTHEAST PLATTE COUNTY WYOMING.  THE STORM WAS MOVING
NORTHEAST AT 20 MILES AN HOUR.

SMALL HAIL...BRIEF HEAVY RAIN AND DANGEROUS LIGHTNING CAN BE EXPECTED
FROM THIS STORM.

PAL
Special weather statement, May 22, 1:48 PM MDT, 30 minutes before
WYZ059>070-NEZ001>03-019>021-054-055-222300-

SEVERE WEATHER OUTLOOK...CORRECTED THE DATE AND EXPIRATION TIME
NATIONAL WEATHER SERVICE CHEYENNE WY
147 PM MDT WED MAY 22 1996

THE SEVERE WEATHER POTENTIAL IN THE COUNTY WARNING AREA OF THE CHEYENNE
NATIONAL WEATHER SERVICE OFFICE IS MODERATE THIS AFTERNOON AND EVENING.

SPOTTER ACTIVATION MAY BE NECESSARY.

DISCUSSION...A DEVELOPING SPRING STORM SYSTEM OVER THE WEST WAS
 GIVING A SOUTHWEST FLOW ALOFT OVER THE AREA WITH INCREASING
 MOISTURE.  AT THE SURFACE...A LOW PRESSURE SYSTEM WILL DEVELOP INTO
 EAST CENTRAL COLORADO AND NORTHWEST KANSAS IN THE AFTERNOON PROVIDING
 A SOUTHTEAST FLOW INTO THE NEBRASKA PANHANDLE AND SOUTHEAST WYOMING.
 THE AIRMASS WILL BECOME UNSTABLE WITH A SLIGHT RISK FOR SEVERE
 THUNDERSTORMS EXPECTED LATER THIS AFTERNOON AND THIS EVENING.

THIS OUTLOOK IS FOR THE FOLLOWING COUNTIES IN SOUTHEAST WYOMING AND
THE NEBRASKA PANHANDLE:
>
WY...ALBANY...CONVERSE...G@OSHEN...LARAMIE...NIOBRARA...PLATTE.

NE...BANNER   BOX BUTTE   CHEYENNE   DAWES   KIMBALL   MORRILL   SIOUX
     SCOTTS BLUFF

WCJIN-WYSE-WYNE

PAL
Special weather statement, May 22, 2:05 PM MDT, 13 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-222115-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
200 PM MDT WED MAY 22 1996

SHOWERS AND THUNDERSTORMS WERE BECOMING FAIRLY WIDESPREAD OVER
SOUTHEAST WYOMING AND PARTS OF THE NEBRASKA PANHANDLE.  AT 155 PM ONE
STRONG STORM WAS DEVELOPING 5 MILES NORTHEAST OF CHEYENNE.  THE SOUTHERN
EDGE OF THIS STORM PRODUCED PEA SIZE HAIL OVER NORTHEAST CHEYENNE.  THE
STORM WAS MOVING EAST AT 20 MPH.  THIS STORM COULD PRODUCE PEA TO
MARBLE SIZE HAIL AS IT MOVES THROUGH EASTERN LARAMIE COUNTY.

OTHER THUNDERSTORM ACTIVITY ACROSS SOUTHEAST WYOMING AND THE NEBRASKA
PANHANDLE WAS WEAK AT 155 PM.  STORMS ARE EXPECTED TO CONTINUE TO
DEVELOP THIS AFTERNOON AND SOME COULD BECOME RATHER STRONG.

JMH

The office that day

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

IssuedProductOfficeCountiesLasted
May 22, 3:00 PM MDTSevere Thunderstorm WarningCYSLaramie30 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 1996Every severe thunderstorm warning in 1996

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; radar from the NEXRAD Level II archive.