Severe Thunderstorm Warning 11, NWS Riverton, WY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
230 PM MDT FRI JUN 6 1997

WATCH BOX OUT TIL 8 PM FOR MOST OF CWA. TS ACTIVITY INCR ON RADAR WITH
BIG HORN BASIN THE LAST TO SEE STORMS ATTM. UNSTABLE AIRMASS WITH 50
DEWPTS. SSW/SMC CHARTS VERIFYING WELL WITH TS DEVELOPMENT AREAS ATTM.
FCST PROB 1ST PD IS THE TS THREAT. EXPECT TS TO KEEP GOING THRU 03Z
MOST PLACES WITH SOME LINGERING IN THE BIG HORN BASIN TIL LATE EVE.
THET-E RIDGE OVR AREA ALONG WITH UNSTABLE AIRMASS THRU 06Z SO LOW SCT
POPS STILL IN ORDER. CLDS DECR AND ISOLD ACTIVITY AFT 06Z. SAT PICS
SHOW SSE FLOW INTO WY THRU 12Z BUT DID NOT SEE ANY SHORTWVS IN FLOW TO
AFFECT CWA THRU 12Z. LOW TEMPS IN THE 50S AGAIN MOST PLACES WITH 40S
IN THE COLDER VALLEYS AND A FEW 30S IN FAR WEST. MORE OF THE SAME IN
STORE FOR CWA SAT AS UPR LO IN SW U.S. DRIFTS IN AZ AND WILL TAKE
ETA/AVN BLEND ON MOVEMENT AS NGM SEEMS TO FAST IN EJECTING THE LOW.
UNSTABLE AIRMASS/THET-E RIDGE OVR THE AREA AGAIN IN THE AFTNOON WITH
INCR IN MID LVL MSTR AS WELL. NEUTRAL 500MB TEMP ADVECTION PROGD WITH
700MB TEMPS ABOUT AS WARM AS TODAY. EXPECT HIGHS IN THE UPR 70S TO
LOWER 80S WITH A FEW SPOTS NR 85 AND THIS WILL HELP TRIGGER MORE TS.
30-40% POPS SEEM BEST ATTM. TS ACTIVITY TO LAST INTO THE EVE HOURS OF
SATURDAY. APPEARS THAT UPR LO WILL MOVE N INTO WY SOMETIME SUNDAY AND
WEAKEN AS IT DOES BUT THIS POSES A GREATER THREAT FOR HEAVY WX COME
SUNDAY.

AR

WYZ001>020-022>028-062025-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
104 PM MDT FRI JUN 6 1997

AT 1 PM MDT THUNDERSTORMS WERE DEVELOPING OVER ALL OF THE WEST HALF OF
WYOMING. THE EXCEPTION WAS IN SWEETWATER COUNTY. INDICATIONS ARE THAT
WE HAVE A SLIGHT RISK OF SEVERE THUNDERSTORMS IN THESE AREAS THROUGH
THE AFTERNOON AND EVENING.

CURRENT STORMS DEVELOPING WERE IN WEST NATRONA COUNTY...WEST FREMONT
COUNTY...NORTHEAST TETON COUNTY...NORTHWEST JOHNSON COUNTY AND
NORTHWEST SUBLETTE COUNTY. THESE THUNDERSTORMS WERE MOVING SLOWLY TO
THE NORTH AT AROUND 10 MPH. ONE THUNDERSTORM SOUTHWEST OF LANDER COULD
HAVE HAIL.

PERSONS SHOULD BE ON THE OUTLOOK FOR THESE THUNDERSTORMS rAND MOVE TO A
SAFE PLACE IF THE NEED ARISES THIS AFTERNOON. THUNDERSTORMS WILL
CONTINUE TO DEVELOP THROUGH THIS EVENING...AGAIN SOME MAY BECOME SEVERE.

WCJIN-WYNW-WYNE

CLARK

WYZ001>015-017-019-020-026>028-062135-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
229 PM MDT FRI JUN 6 1997

...SEVERE THUNDERSTORM WATCH IN EFFECT FOR NORTHWEST AND NORTH CENTRAL
WYOMING UNTIL 800 PM MDT...

A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR NORTHWEST AND NORTH
CENTRAL WYOMING UNTIL 800 PM MDT THIS EVENING. AT 215 PM MDT DOPPLER
WEATHER RADAR IN RIVERTON SHOWED THUNDERSTORMS DEVELOPING RAPIDLY
OVER PARTS OF NORTHWEST AND NORTH CENTRAL WYOMING. THE STRONGEST STORMS
WERE OVER THE WIND RIVER MOUNTAINS SOUTHWEST OF LANDER...OVER
EXTREME SOUTHEAST NATRONA COUNTY SOUTH OF CASPER...AND OVER SOUTHERN
PARK COUNTY. THE STORMS WERE GENERALLY MOVING NORTHEAST AT AROUND 20
MPH.

LARGE HAIL...DAMAGING WINDS...FREQUENT LIGHTNING...AND VERY HEAVY RAIN
WILL ACCOMPANY SOME OF THE THUNDERSTORMS IN NORTHWEST AND NORTH
CENTRAL WYOMING THIS AFTERNOON AND EVENING. RESIDENTS SHOULD STAY
ABREAST OF CHANGING WEATHER CONDIbTIONS AND LISTEN TO NOAA WEATHER
RADIO...COMMERCIAL RADIO AND TV OR CABLE TV FOR THE LATEST WATCH
INFORMATION AND POSSIBLE WARNINGS.

WCJIN-WYNW-WYNE

NOLL