Severe Thunderstorm Warning 31, NWS Riverton, WY

Issued

Aug 22, 2003, 4:02 PM MDT (22:02 UTC)

Expired

Aug 22, 2003, 4:45 PM MDT

In force

43 min

Issued by

NWS Riverton, WY

Area

Counties, with a storm outline in the text

Counties Lincoln County, WY, Teton County, WY

The Pocatello radar (KSFX), 141 km from the middle of the area, began a volume at 22:02 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.

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

000 
WUUS55 KRIW 222202
SVRRIW
WYC023-039-222245-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RIVERTON WY
401 PM MDT FRI AUG 22 2003

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN TETON COUNTY IN NORTHWEST WYOMING
  EXTREME NORTHWESTERN LINCOLN COUNTY IN WEST CENTRAL WYOMING

* UNTIL 445 PM MDT

* AT 401 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 6 MILES NORTHWEST OF ALPINE...OR ABOUT 24 MILES
  SOUTHWEST OF JACKSON...MOVING NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  6 MILES NORTH OF ALPINE AROUND 400 PM MDT
  NEAR RAFTER J RANCH AROUND 430 PM MDT
  6 MILES SOUTHEAST OF JACKSON AROUND 440 PM MDT

THE SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING HAIL UP TO ONE INCH
IN DIAMETER.
THE SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING WINDS OF 60 MILES AN
HOUR.

LARGE HAIL AND DAMAGING WINDS ARE EXPECTED WITH THIS STORM. TAKE
COVER IN A STURDY BUILDING AND AVOID WINDOWS.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4324 11129 4309 11116 4337 11047 4358 11065

$$

NWS Riverton, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 22, 2:54 PM MDT, 1 hour 8 minutes earlier.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
254 PM MDT FRI AUG 22 2003

.TONIGHT THROUGH MONDAY NIGHT...
WV/IR IMAGERY SHOWING SCT TSTMS FIRING ACROSS UT...EASTERN ID INTO
WESTERN WY...ASSOCIATED WITH 250 MB DIFFLUENT FLOW AND GOOD
INSTABILITY. HAD ONE STRONG CELL MOVE ACROSS WESTERN TETON COUNTY.
OTHERWISE...MOSTLY SUNNY ACROSS THE EASTERN CWFA.

LOOKS LIKE SHORT WAVE ENERGY AND SOME 7-3H VERTICAL MOTION ACROSS
THE WESTERN CWFA TONIGHT...SO SCT POPS LOOK GOOD. WILL GO WITH
ISOLD POPS ACROSS THE EASTERN CWFA. MOST OF THE TSTMS SHOULD END BY
23/06Z. UPPER LEVEL SOUTHWEST FLOW AND WEAKER INSTABILITY WILL
BRING ISOLD TO SCT POPS TO THE AREA SATURDAY AFTERNOON AND EVENING.
LOOKS LINE MAINLY DRY WEATHER FOR SUNDAY AND MONDAY. COOL FRONT TO
MOVE SOUTH ACROSS MUCH OF AREA ON MONDAY...HOWEVER MOST OF 700 MB
CAA TO REMAIN NORTH ACROSS MT.   MC

.TUESDAY THROUGH FRIDAY...
WNW FLOW TUE WITH DRY WX. WARMER FAR WEST AND SLIGHT WARMING CENT/E.
WARMER WED AND DRY WITH UPPER RIDGE TO OUR W AT 00Z THU. UPPER RIDGE
AXIS CLOSE TO W WY BORDER 00Z FRI WITH GFS WANTING TO BRING SOME
MID/HI LEVEL MOISTURE INTO AREA. HAVE LOW POPS IN EVERYWHERE AND WILL
NOT ADJUST THIS FAR OUT. A TAD WARMER THU. AS FOR FRI WILL HAVE LOW
POPS IN S ZONES FOR NOW AND HIGH TEMPS CLOSE TO THU VALUES.

.RIW...NONE.

WYZ001>020-022>030-231200-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
600 AM MDT FRI AUG 22 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS
THE AREA THIS AFTERNOON AND PERSIST INTO THE EVENING...ESPECIALLY IN
THE SOUTH AND FAR WEST. THE MAIN THREAT WITH THE STORMS WILL BE
CLOUD TO GROUND LIGHTNING AND GUSTY WIND UP TO 50 MPH.  A FEW STORMS
IN THE FAR WEST MAY HAVE LOCALLY HEAVY RAIN.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS
THE AREA DURING THE AFTERNOON AND EVENING HOURS ON SATURDAY. THE MAIN
THREAT WITH THE STORMS WILL BE CLOUD TO GROUND LIGHTNING AND GUSTY
WINDS UP TO 40 MPH.  OTHERWISE THE PROBABILITY OF WIDESPREAD
HAZARDOUS WEATHER IS LOW SUNDAY THROUGH THURSDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON THROUGH THIS EVENING.

Severe Thunderstorm Warnings in Wyoming, 2003Every severe thunderstorm warning in 2003

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.