MESOSCALE DISCUSSION 1064
   NWS STORM PREDICTION CENTER NORMAN OK
   0523 PM CDT TUE MAY 27 2008
   
   AREAS AFFECTED...NRN NV...SERN OR AND SWRN ID
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 272223Z - 280000Z
   
   STORMS WITH SEVERE HAIL ARE POSSIBLE THE NEXT FEW HOURS ACROSS
   PORTIONS OF NRN NV...SERN OREGON AND SWRN ID. THE THUNDERSTORMS 
   SHOULD BE VERY WIDELY SCATTERED ACROSS A LARGE AREA AND SHEAR IS
   MARGINAL FOR STRONG AND LONG LIVED UPDRAFTS...SO A WW IS NOT
   ANTICIPATED.
   
   WV IMAGERY SHOWED A MID LEVEL CIRCULATION WAS MOVING NNEWD INTO SWRN
   NV...AND WILL CONTINUE TO MOVE THROUGH NV DURING THE EVENING HOURS.
   STRONG DIFFLUENCE ALOFT/LARGE SCALE LIFT LOCATED AHEAD OF THIS
   SYSTEM HAS RESULTED IN NUMEROUS THUNDERSTORMS TO DEVELOP AHEAD OF
   THIS SYSTEM. DESPITE RELATIVELY COOL SURFACE TEMPERATURES...COLD
   READINGS IN THE MID/UPPER LEVEL LEVELS...INCLUDING -16 TO -18C AT
   500 MB...WAS RESULTING IN STEEP LAPSE RATES AND SBCAPES UP TO 1000
   J/KG. DEEP LAYER SHEAR IS NOT PARTICULARLY STRONG...20-30 KT...BUT
   STEEP LAPSE RATES AND AMOUNT OF INSTABILITY SHOULD BE SUFFICIENT FOR
   A FEW STORMS TO PRODUCE SEVERE HAIL.
   
   ..IMY.. 05/27/2008
   
   
   ATTN...WFO...BOI...LKN...REV...
   
   39001744 40101894 43301928 44161771 43821622 42681523
   39411589