Alert archive / Wyoming / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 13, NWS Riverton, WY

June 21, 1996Park County, Teton County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jun 21, 1996, 8:11 PM MDT for Park County, Teton County, Wyoming. It was in force for 49 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: Jun 21, 1996, 8:11 PM MDT (02:11 UTC)
Expired: Jun 21, 1996, 9:00 PM MDT
In force: 49 min
Issued by: NWS Riverton, WY
Area: Whole counties

Counties Park County, WY, Teton County, WY

The nearest sounding before it

Riverton, WY (KRIW), launched 00:00Z, 2.2 hours before the alert went out and 187 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 33 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 1189 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: 37 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 KRIW 220211
SVRRIW
WYC029-039-220300-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RIVERTON WY
811 PM MDT FRI JUN 21 1996

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 900 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHWEST WYOMING

   ...WESTERN PARK COUNTY
   ...NORTHEASTERN TETON COUNTY
 
...POSSIBLE SEVERE THUNDERSTORM IN NORTHEAST TETON COUNTY IN CENTRAL
YELLOWSTONE PARK...

A POSSIBLE SEVERE THUNDERSTORM WAS INDICATED BY RIVERTON RADAR NEAR
LAKE YELLOWSTONE IN YELLOWSTONE PARK. THIS STORM WILL LIKELY PRODUCE
LARGE HAIL AND WIND GUSTS OVER 45 MPH. THE STORM IS TRACKING
NORTHEAST AT 35 MPH AND WILL MOVE INTO THE NORTHEAST PART OF
YELLOWSTONE IN WEST PARK COUNTY PASSING OVER THE EASTERN PARK
ENTRANCE HIWAY 20 BY 8:20 PM.

 
BOATERS ON LAKE YELLOWSTONE SHOULD MOVE TO SHORE IMMEDIATLY IF ANY 
STORMS APPROACH. IF YOU ARE CAUGHT OUTSIDE...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.

WCJIN-WYNW
RWM

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 21, 3:19 PM MDT, 4 hours 52 minutes before

WYZ011>013-016>023-212120

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
320 MDT THU JUN 20 1996

...SEVERE THUNDERSTORM WARNING FOR CENTRAL AND NORTHERN FREMONT COUNTY
   UNTIL 355 PM...
...STRONG THUNDERSTORMS CONTINUE IN SOUTHWEST WYOMING...

A SEVERE THUNDERSTORM WARNING HAS BEEN ISSUED FOR CENTRAL AND NORTHERN
FREMONT COUNTY.  DOPPLER RADAR INDICATES A SEVERE THUNDERSTORM JUST
NORTHWEST OF RIVERTON.  THIS STORM HAS DROPPED HAIL OVER SOUTH
PASS...HUDSON AND WEST OF RIVERTON.

AT 300 PM WEATHER RADAR CONTINUED TO INDICATE STRONG THUNDERSTORMS
OVER CENTRAL AND NORTHERN FREMONT COUNTY.  ADDITIONAL STRONG
THUNDERSTORMS ARE CURRENTLY INDICATED IN NORTHEAST UTAH...LINCOLN AND
TWO SEPERATE CLUSTERS OVER SWEETWATER COUNTIES.  THESE STORMS ARE
MOVING TOWARD THE NORTHEAST AND WILL LIKELY TRACK ALONG A SIMILAR PATH
THROUGH SOUTHERN LINCOLN AND WESTERN SWEETWATER COUNTIES AND SHOULD
ENTER FREMONT COUNTY WITHIN THE NEXT HOUR.  WE CAN EXPECT THIS
THUNDERSTORM ACTIVITY TO CONTINUE FOR THE NEXT TWO HOURS ALONG WITH
DANGEROUS WIND GUSTS TO 40 MPH...FREQUENT CLOUD TO GROUND LIGHTNING
AND POSSIBLE HAIL.
>
WJIN-WYNW-WYSW
DAL

Local storm report, Jun 21, 7:20 PM MDT, 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RIVERTON WYOMING
721 PM MDT FRI JUN 21 1996

TIME(MDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0640 PM                              WY   1 INCH HAIL
06/21/96   LINCOLN                        1" HAIL REPORTED AT FOSSIL
                                          BUTTE NATIONAL MONUMENT 10
                                          M.ILES WEST OF KEMMERER.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 6:14 PM MDT	Severe Thunderstorm Warning	RIW	Lincoln	61 min
Jun 21, 7:08 PM MDT	Severe Thunderstorm Warning	RIW	Lincoln	42 min
Jun 21, 7:30 PM MDT	Severe Thunderstorm Warning	RIW	Lincoln, Teton	60 min
Jun 21, 8:26 PM MDT	Severe Thunderstorm Warning	RIW	Teton	64 min
Jun 21, 9:20 PM MDT	Severe Thunderstorm Warning	RIW	Teton	30 min
Jun 22, 3:16 AM MDT	Severe Thunderstorm Warning	RIW	Park	44 min
Jun 22, 12:03 PM MDT	Severe Thunderstorm Warning	RIW	Sweetwater	62 min
Jun 22, 12:47 PM MDT	Severe Thunderstorm Warning	RIW	Park	58 min
Jun 22, 1:49 PM MDT	Severe Thunderstorm Warning	RIW	Hot Springs	56 min
Jun 22, 2:58 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn	37 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 1996 Every 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.