Tornado Warning 1, 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

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RIVERTON WYOMING
313 AM MDT FRI JUN 06 1997

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

0345 PM    5 S JACKSON               WY   1.75 INCH HAIL
06/05/97   TETON

0435 PM    AFTON                     WY   1 INCH HAIL
06/05/97   LINCOLN                        JUST NW AFTON

0448 PM    THAYNE                    WY   1.5 INCH HAIL
06/05/97   LINCOLN

0830 PM    2 S THERMOPOLIS           WY   .75 INCH HAIL
06/05/97   HOT SPRINGS                    GRAPE SIZE HAIL REPORTED
                                          BY OFF DUTY HOT SPRINGS
                                          CO<UNTY POLICE OFFICER FROM
                                          NORTH SIDE OF THE WIND
                                          RIVER CANYON

PRELIMINARY LOCAL STORM REPORT...REXMIT
NATIONAL WEATHER SERVICE RIVERTON WYOMING
313 AM MDT FRI JUN 06 1997

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

0345 PM    5 S JACKSON               WY   1.75 INCH HAIL
06/05/97   TETON

0435 PM    AFTON                     WY   1 INCH HAIL
06/05/97   LINCOLN                        JUST NW AFTON

0448 PM    THAYNE                    WY   1.5 INCH HAIL
06/05/97   LINCOLN

0830 PM    2 S THERMOPOLIS           WY   .75 INCH HAIL
06/05/97   HOT SPRINGS                    GRAPE SIZE HAIL REPORTED
                                          BY OFF DUTY HOT SPRINGS
                                   >       COUNTY POLICE OFFICER FROM
                                          NORTH SIDE OF THE WIND
                                          RIVER CANYON

WYZ001>010-012-013-015-016>028-070300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
958 AM MDT FRI JUN 6 1997

THE SEVERE WEATHER POTENTIAL IN MOST OF NORTHERN AND CENTRAL WYOMING WILL
BE SLIGHT THIS AFTERNOON AND EVENING.

SPOTTER ACTIVATION MAY BE NECESSARY LATER THIS AFTERNOON INTO THE EVENING

DISCUSSION...A FAIRLY MOIST UNSTABLE AIRMASS IS OVER THE REGION.  THIS
ALONG WITH WARM SURFACE TEMPERATURES WILL HELP THUNDERSTORM DEVELOPMENT
FROM MID AFTERNOON THROUGH MID EVENING.  LARGE HAIL AND STRONG WINDS ARE
THE MAIN THREAT FROM THE STRONG STORMS.

THIS OUTLOOK IS FOR THE FOLLOWING COUNTIES IN NORTHERN AND CENTRAL WYOMING:
JOHNSON  NATRONA  FREMONT  HOT SPRINGS  WASHAKI@E  BIG HORN  PARK  TETON
YELLOWSTONE NATIONAL PARK

WCJIN-WYNW-WYNE
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