MESOSCALE DISCUSSION 1245
   NWS STORM PREDICTION CENTER NORMAN OK
   0137 PM CDT THU JUN 16 2011
   
   AREAS AFFECTED...CNTRL AND NERN UT...NWRN CO AND SERN WY
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 161837Z - 162030Z
   
   STORMS DEVELOPING FROM THE GREAT BASIN AREA INTO THE CNTRL ROCKIES
   MAY BECOME CAPABLE OF PRODUCING ISOLATED DOWNBURST WINDS AND HAIL.
   TRENDS WILL CONTINUE TO BE MONITORED FOR A POSSIBLE WW.
   
   SCATTERED STORMS ARE INCREASING FROM CNTRL-NERN UT INTO SERN WY IN
   VICINITY OF QUASISTATIONARY BAROCLINIC ZONE AND WITHIN PLUME OF MID
   LEVEL MOISTURE AHEAD OF SHORTWAVE TROUGH PIVOTING THROUGH BASE OF
   UPPER LOW. THE ATMOSPHERE CONTINUES TO DESTABILIZE SUPPORTED BY
   STEEP MID LEVEL LAPSE RATES AND STRONG DIABATIC WARMING WITH
   TEMPERATURES RISING THROUGH THE UPPER 80S. BOUNDARY LAYER MOISTURE
   IS MODEST WITH DEWPOINTS IN THE 30S AND MAY SERVE AS A LIMITING
   FACTOR. INSTABILITY WILL REMAIN MARGINAL WITH MLCAPE AOB 800 J/KG
   OWING TO MEAGER LOW LEVEL MOISTURE. HOWEVER...LARGE
   TEMPERATURE-DEWPOINTS SPREADS AND INVERTED-V BOUNDARY LAYERS WILL
   PROMOTE A DOWNBURST THREAT. VERTICAL SHEAR OF 40-50 KT WILL ALSO
   SUPPORT POTENTIAL FOR HIGH BASED SUPERCELLS WITH MARGINALLY SEVERE
   HAIL ALSO POSSIBLE.
   
   ..DIAL.. 06/16/2011
   
   
   ATTN...WFO...BOU...CYS...RIW...GJT...SLC...
   
   LAT...LON   41940641 42240496 41650447 41060477 40070689 39230893
               38721035 38271190 39081230 39921083 40730908 41940641