MESOSCALE DISCUSSION 1399
   NWS STORM PREDICTION CENTER NORMAN OK
   0552 PM CDT WED JUL 01 2009
   
   AREAS AFFECTED...NERN NV/NRN UT/S CNTRL AND SERN ID
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 012252Z - 012345Z
   
   ISOLD STRONG TO SEVERE STORMS CAPABLE OF HAIL/DMGG WINDS WILL BE
   POSSIBLE OVER THE NEXT FEW HOURS. DUE TO ISOLD NATURE...A WW IS NOT
   ANTICIPATED.
   
   INCREASING PWAT VALUES ON THE NWRN PERIPHERY OF AN UPPER
   RIDGE...NEAR 130 TO 150 PERCENT OF CLIMATOLOGICAL NORMALS PER 12Z
   RAOBS AND GOES SATELLITE IMAGERY...HAVE BEEN FAVORABLE FOR
   THUNDERSTORM DEVELOPMENT OVER THE HIGHER TERRAIN AS AMPLE SURFACE
   HEATING CONTINUES TO DESTABILIZE THE ATMOSPHERE. APPEARANCE ON
   VISIBLE IMAGERY AND COOLING TOPS ON IR SEEM TO SUGGEST SOME
   STRENGTHENING OF A CLUSTER OF STORMS MOVING ENEWD THROUGH NERN
   NV/NWRN UT. THIS IS LIKELY PARTLY IN RESPONSE TO A SUBTLE VORT MAX
   NOW MOVING INTO NERN NV. AS THE STORMS CONTINUE TO PROGRESS
   NEWD...MARGINAL INSTABILITY AND 30 TO 35 KTS EFFECTIVE SHEAR MAY
   SUPPORT BRIEF STORM ROTATION AND OCCASIONALLY SEVERE HAIL. STEEP LOW
   LEVEL LAPSE RATES AND LARGE TEMPERATURE DEW POINT SPREADS MAY BE
   SUPPORTIVE OF STRONG TO SEVERE WIND GUSTS AS STORMS GRADUALLY MOVE
   OFF THE HIGHER TERRAIN.
   
   ..HURLBUT.. 07/01/2009
   
   
   ATTN...WFO...SLC...PIH...BOI...LKN...
   
   LAT...LON   41561199 40921297 40601376 40811527 40941588 41381600
               41961437 42251333 42241227 41561199