Severe Thunderstorm Warning 19, NWS Riverton, WY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
206 PM MDT WED JUN 27 2001

ISOLATED TS OBSERVED EARLY THIS AFTERNOON ALONG ABSAROKA...WIND
RIVER AND BIG HORN RANGES.   NOTHING TO REPORT YET IN BASINS.
SHORTWAVE SHEARING ACROSS CENTRAL WYOMING EARLY THIS AFTERNOON NEAR
A COD-RWL LINE.  LAPS DATA SHOWS A SLOW TREND TOWARD STABILIZATION
WITH HIGHER LI/S AND LOWER CAPES ALONG AND BEHIND SHORTWAVE AXIS.
BEST REMAINING AREA OF INSTABILITY BULLSEYED OVER BYG.  SHORT WAVE
AXIS PROGGED TO BE AT A SHR-CPR LINE BY 00Z WITH CONVECTION MOSTLY
NORTH OF CWFA.  SLIGHT H5 COOLING ALONG AND BEHIND TROUGH AXIS (-
12C OVER SLC AT 12Z) WILL RESULT IN SOME INSTABILITY AND TS ACROSS
NORTHERN ZONES THROUGH SUNSET...SO WILL PUT IN LOW SCATTERED POPS.
WEAK SHORTWAVE SHEARING ACROSS OREGON THIS AFTERNOON WILL BRUSH NW
CORNER WITH ADEQUATE MOISTURE AND LOW LEVEL CONVERGENCE TO WARRANT
LOW POPS.  OTHERWISE REST OF CWFA CLEARS OUT.   THURSDAY AND FRIDAY
LOOK OVERALL VERY SIMILAR AS FAR AS TEMPERATURES AND AREAS OF
MOISTURE/INSTABILITY FOR ZONE WORDING.  SURFACE HIGH PRESSURE BUILDS
INTO MONTANA WITH SOUTHEAST FLOW ADVECTING IN HIGHER DEWPOINTS
ACROSS NORTHEAST.  CAPES NEAR 1000 J/KG AND LI/S OF -4 BACK INTO BYG
...DECREASING WESTWARD.   SOUTH AND CENTRAL ZONES IN MORE STABLE AND
DRY AIR.  THUS...WILL GO LOW SCATTERED POPS NORTH CENTRAL ZONES
WITH NIL CENTRAL AND SOUTH.  GRADUAL WARMING AT H7 FROM 10C THIS
MORNING UP TO 16C FRIDAY.  IN EXTENDED...HOT AND WITH SLIGHT
CHANCE OF AFTN/EVE TS COVERS THE PERIOD AS 595 HIGH ANCHORS NEAR
FOUR CORNERS.  WEAK SHORTWAVE PROGGED TO MOVE THROUGH SOUTHERN
ALBERTA/SASKATCHEWAN SUNDAY WILL LIKELY KICK UP THE WINDS BUT DON/T
SEE ANY COOLING MAKING IT THIS FAR SOUTH.

.RIW...NONE.
AEM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RIVERTON, WY
316 PM MDT WED JUN 27 2001

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....
`
0212 PM    12 WNW KIRBY              WY   1.00 INCH HAIL
06/27/01   HOT SPRINGS                    REPORTED BY SPOTTERS

DAL

WYZ008-009-272200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
316 PM MDT WED JUN 27 2001

AT 305 PM DOPPLER RADAR INDICATED A STRONG THUNDERSTORM JUST WEST OF
THERMOPOLIS. THIS STORM WAS MOVING EAST AT 10 MPH. THIS STORM WILL
MOVE ACROSS THERMOPOLIS BY 320 PM.

THIS STORM WILL PRODUCE WIND GUSTS TO 40 MPH...VERY HEAVY
RAIN...SMALL HAIL AND CLOUD TO GROUND LIGHTNING. PERSONS IN THE PATH
OF THIS STORM SHOULD MOVE TO A PLACE OF SAFETY.

ALSO...OTHER STORMS ARE DEVELOPING OVER WESTERN HOT SPRINGS COUNTY.
THESE STORMS WILL SHOW LITTLE MOVEMENT THROUGH 400 PM.

CUNNINGHAM

WCJIN-WYNW

WYZ008-013-272300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
412 PM MDT WED JUN 27 2001

...THUNDERSTORMS POISED FOR BOYSEN RESERVOIR...

AT 406 PM MDT WEATHER RADAR INDICATED STRONG THUNDERSTORMS RAPIDLY
DEVELOPING 13 MILES WEST OF BOYSEN RESERVOIR IN NORTHEAST FREMONT
COUNTY. THIS STORM IS MOVING EAST AT 10 MPH AND SHOULD ARRIVE AT
BOYSEN RESERVOIR AS WELL AS THE WIND RIVER CANYON BY 435 PM. BEFORE
THE STORM ARRIVES NORTHWEST WINDS WILL GRADUALLY INCREASE. ONCE THE
STORM ARRIVES WIND GUSTS OF UP TO 40 MPH WILL LIKELY OCCUR.

CLOUD TO GROUND LIGHTNING AND LOCALLY HEAVY RAINFALL WILL ALSO OCCUR
WITH THIS STORM.

IF YOU ARE OUT IN THE MIDDLE OF THE hLAKE WHEN THE THREATENING
WEATHER APPROACHES SEEK SHELTER IMMEDIATELY. BE READY FOR RAPIDLY
REDUCED VISIBILITY ON ROADWAYS FROM HEAVY RAINFALL.

WCJIN-WYNW
LIPSON

WYZ015-027-028-280015-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
519 PM MDT WED JUN 27 2001

AT 508 PM DOPPLER RADAR INDICATED ISOLATED THUNDERSTORMS OVER
JOHNSON AND NATRONA COUNTIES. A BAND OF STORMS WITH VERY HEAVY RAIN
AND SMALL HAIL WAS LOCATED 10 TO 25 MILES SOUTH OF BUFFALO. THESE
STORMS WILL MOVE SLOWLY NORTH AND PRODUCE ANOTHER 1/2 TO 3/4 INCHES
OF RAIN THROUGH 615 PM...WEST OF I-25.

OTHER ISOLATED STORMS WILL MOVE EAST ACROSS NATRONA COUNTY THROUGH
615 PM.

CUNNINGHAM

WCJIN-WYNE