Alert archive / Wyoming / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 9, NWS Riverton, WY

June 21, 1996Fremont County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jun 21, 1996, 3:43 PM MDT for Fremont County, Wyoming. It was in force for 62 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, 3:43 PM MDT (21:43 UTC)
Expired: Jun 21, 1996, 4:45 PM MDT
In force: 62 min
Issued by: NWS Riverton, WY
Area: Whole counties

County Fremont County, WY

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 9.7 hours before the alert went out and 369 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2304 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 231 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, Jun 21, 12:17 PM MDT, 3 hours 26 minutes before

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Special weather statement, Jun 21, 1:33 PM MDT, 2 hours 10 minutes before

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Special weather statement, Jun 21, 1:57 PM MDT, 1 hour 46 minutes before

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Special weather statement, Jun 21, 3:19 PM MDT, 24 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

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 2:02 PM MDT	Severe Thunderstorm Warning	RIW	Fremont, Sublette	58 min
Jun 21, 2:28 PM MDT	Severe Thunderstorm Warning	RIW	Sweetwater	62 min
Jun 21, 2:38 PM MDT	Flash Flood Warning	RIW	Fremont	3 hr
Jun 21, 2:56 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	59 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.