Utah's Weather: SEVERE THUNDERSTORM WATCH

SEVERE THUNDERSTORM WATCH

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH
 604 IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR THE FOLLOWING AREAS
 
 IN UTAH THIS WATCH INCLUDES 20 COUNTIES
 
 IN CENTRAL UTAH
 
 CARBON                EMERY                 JUAB                 
 MILLARD               PIUTE                 SANPETE              
 SEVIER                
 
 IN NORTHERN UTAH
 
 BOX ELDER             CACHE                 DAVIS                
 DUCHESNE              MORGAN                RICH                 
 SALT LAKE             SUMMIT                TOOELE               
 UTAH                  WASATCH               WEBER                
 
 IN SOUTHERN UTAH
 
 BEAVER                
 
 IN WYOMING THIS WATCH INCLUDES 1 COUNTY
 
 IN SOUTHWEST WYOMING
 
 UINTA                 
 
 THIS INCLUDES THE FOLLOWING LOCATIONS...AMERICAN FORK...BEAVER...
 BOUNTIFUL...BRIGHAM CITY...CALLAO...CASTLE DALE...CIRCLEVILLE...
 COALVILLE...DELTA...DUCHESNE...EVANSTON...FAIRVIEW...FARMINGTON...
 FERRON...FILLMORE...GOBLIN VALLEY...GRANTSVILLE...GREEN RIVER...
 GUNNISON...HEBER CITY...HUNTSVILLE...JUNCTION...LAKETOWN...
 LAYTON...LOGAN...MANTI...MIDVALE...MILFORD...MINERSVILLE...
 MONROE...MORGAN...NEPHI...OGDEN...PARK CITY...PRICE...PROVO...
 RANDOLPH...RICHFIELD...ROOSEVELT...ROY...SALINA...
 SALT LAKE CITY...SANDY...STRAWBERRY RESERVOIR...SUGARHOUSE...
 TOOELE...TREMONTON AND WOODRUFF.
 
 $$
 
 FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
 HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)

 CURRENT  MESOSCALE DISCUSSION 1850
   NWS STORM PREDICTION CENTER NORMAN OK
   0131 PM CDT SAT SEP 01 2012
   
   AREAS AFFECTED...MUCH OF UTAH...NWRN NV
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 011831Z - 012030Z
   
   PROBABILITY OF WATCH ISSUANCE...40 PERCENT
   
   SUMMARY...THUNDERSTORM COVERAGE WILL INCREASE THRU THE
   AFTERNOON...WITH SUFFICIENT BUOYANCY/SHEAR TO SUPPORT A THREAT OF
   SEVERE WIND GUSTS AND PERHAPS SEVERE HAIL. COVERAGE TRENDS WILL
   CONTINUE TO BE MONITORED FOR THE POSSIBILITY OF WATCH ISSUANCE.
   
   DISCUSSION...AS OF 18Z...DEEP CONVECTION IS INCREASING ACROSS WRN
   UT...WITH TWO STRONG CELLS OVER MILLARD COUNTY SHOWING SOME MIDLEVEL
   ROTATION. VIS SATELLITE IMAGERY SHOWS A DEEPENING CU FIELD WITH
   ADDITIONAL STORMS BEGINNING TO DEVELOP ACROSS NRN UT AND FAR WRN NV.
   THIS ACTIVITY IS OCCURRING IN THE EXIT REGION OF 60-80 KT MID-UPPER
   LEVEL JET...WHICH WAS SAMPLED BY THE 12Z VEF SOUNDING. 
   
   TEMPERATURES HAVE WARMED INTO THE 75-80F RANGE ACROSS MUCH OF THE
   AREA AS OF 18Z. THE AIRMASS REMAINS RELATIVELY MOIST...WITH
   DEWPOINTS GENERALLY IN THE 54-58F RANGE. THESE CONDITIONS ARE
   SUPPORTING MODERATE MUCAPE OF 1000-2000 J/KG. MEANWHILE...MODERATE
   MIDLEVEL FLOW IS SUPPORTING EFFECTIVE SHEAR OF 35-45 KTS...WHICH IS
   SUFFICIENT FOR THE DEVELOPMENT OF ORGANIZED STORM MODES...WITH
   BOWING SEGMENTS AND OCCASIONAL SUPERCELLS POSSIBLE.  
   
   AS THE BOUNDARY LAYER WARMS/DEEPENS...THE SEVERE WIND THREAT WILL
   INCREASE. IN ADDITION...A SEVERE HAIL THREAT WILL EXIST WITH ANY
   SUPERCELL THAT DEVELOPS. IF ORGANIZED CONVECTION CONTINUES TO
   INCREASE...SEVERE THUNDERSTORM WATCH ISSUANCE WILL BE POSSIBLE. THE
   SEVERE THREAT WILL START TO DECREASE FROM THE SOUTHWEST LATER THIS
   AFTERNOON AS MUCH DRIER AIR MOVES IN...BUT THE THREAT MAY PERSIST
   INTO THE EVENING FURTHER NORTH ACROSS NRN UT.
   
   ..DEAN/CORFIDI.. 09/01/2012
   
   
   ATTN...WFO...GJT...SLC...VEF...LKN...
   
   LAT...LON   37611418 38331466 38971488 39611521 40531577 41461458
               41921343 41761140 40760990 40120979 39351019 38831055
               38341110 37521184 37101238 37121351 37611418

    URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 604
   NWS STORM PREDICTION CENTER NORMAN OK
   100 PM MDT SAT SEP 1 2012
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          CENTRAL AND NORTHERN UTAH
          SOUTHWEST WYOMING
   
   EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 100 PM UNTIL
   900 PM MDT.
   
   SCATTERED DAMAGING WINDS
   ISOLATED WIND GUSTS TO 65 MPH POSSIBLE
   WIDELY SCATTERED LARGE HAIL TO 1.5 INCHES IN DIAMETER
   ISOLATED TORNADOES
   
   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75
   STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH
   NORTHWEST OF EVANSTON WYOMING TO 25 MILES EAST OF MILFORD UTAH. 
   FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU4).
   
   REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
   FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
   AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
   THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
   AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
   DO PRODUCE TORNADOES.