MESOSCALE DISCUSSION 1074
   NWS STORM PREDICTION CENTER NORMAN OK
   0906 PM CDT THU JUN 13 2013

   AREAS AFFECTED...CNTRL/ERN MT

   CONCERNING...SEVERE THUNDERSTORM WATCH 309...

   VALID 140206Z - 140300Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 309
   CONTINUES.

   SUMMARY...SCATTERED STRONG-SVR TSTMS CONTINUE TO AFFECT PORTIONS OF
   CNTRL/ERN MT. WW 309 IS SCHEDULED TO EXPIRE AT 0300Z...BUT MAY NEED
   TO BE LOCALLY EXTENDED...OR POSSIBLY REQUIRE ISSUANCE OF A NEW WW.

   DISCUSSION...SCATTERED TSTMS CONTINUE TO REGENERATE ACROSS CNTRL/ERN
   MT WITHIN A BROAD ZONE OF ASCENT AHEAD OF A PAC NW UPPER TROUGH.
   DESPITE SOME BOUNDARY LAYER COOLING OVER THE PAST COUPLE HRS...RADAR
   TRENDS INDICATE THAT THE POTENTIAL FOR LARGE HAIL AND DMGG WINDS
   PERSISTS WITHIN THE STRONGEST CONVECTIVE CORES...WITH OCCASIONAL
   SUPERCELL STRUCTURES. ALTHOUGH INSTABILITY IS FORECAST TO SLOWLY
   DECREASE IN CONCERT WITH CONTINUED BOUNDARY LAYER COOLING...STEEP
   MIDLEVEL LAPSE RATES AND MODERATELY STRONG FLOW ALOFT COULD CONTINUE
   TO SUPPORT STRONG TO POSSIBLY SVR CONVECTION BEYOND THE WATCH
   EXPIRATION TIME. ADDITIONALLY...13/12Z NSSL-WRF AND 14/00Z SUGGESTS
   ADDITIONAL CONVECTION WILL CONTINUE TO REGENERATE ACROSS CNTRL/ERN
   MT AND MAY EVENTUALLY CONSOLIDATE INTO AN ORGANIZED LINE OVER THE
   HIGH PLAINS. THUS...THE NEED FOR A LOCAL EXTENSION IN TIME OF WW
   309...OR POSSIBLY ISSUANCE OF A NEW WW...WILL CONTINUE TO BE
   ASSESSED PRIOR TO SCHEDULED EXPIRATION TIME OF 0300Z.

   ..ROGERS/HART.. 06/14/2013


   ATTN...WFO...BIS...UNR...BYZ...GGW...TFX...

   LAT...LON   48990490 48670387 46100383 45260486 45050629 45050736
               45180931 45370962 46800956 47540940 48300916 48830860
               48920785 48950598 48990490