MESOSCALE DISCUSSION 0594
   NWS STORM PREDICTION CENTER NORMAN OK
   0447 PM CDT SUN MAY 05 2013
   
   AREAS AFFECTED...NRN SIERRA NEVADA AND KLAMATH MTNS
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 052147Z - 052345Z
   
   PROBABILITY OF WATCH ISSUANCE...5 PERCENT
   
   SUMMARY...ISOLATED TO SCATTERED TSTM COVERAGE IS EXPECTED TO PERSIST
   THROUGH THE AFTERNOON. SOME SMALL HAIL AND GUSTY WINDS MAY BE
   POSSIBLE WITH THE STRONGEST STORMS. MARGINAL NATURE OF THREAT
   PRECLUDES THE NEED FOR A WW.
   
   DISCUSSION...TSTM ACTIVITY HAS INCREASED ACROSS PORTIONS OF THE NRN
   SIERRA NEVADAS AND KLAMATH MTNS DURING THE LAST HOUR. OVERALL STORM
   INTENSITY HAS REMAINED BELOW SVR LIMITS WITH THE EXCEPTION OF ONE
   STORM IN SIERRA AND PLUMAS COUNTIES. THERMODYNAMIC ENVIRONMENT IS
   CHARACTERIZED BY MODEST ELEVATED INSTABILITY /SBCAPE AROUND 500 J
   PER KG/ ASSOCIATED WITH MID-LEVEL MOISTURE PIVOTING AROUND AN UPPER
   LOW SLOWLY RETROGRADING SWWD. UPSLOPE FLOW WILL FAVOR CONTINUED
   DEVELOPMENT OVER THE MOUNTAINS WITH STORMS LOSING STRENGTH AS THEY
   MOVE WWD INTO A LESS FAVORABLE THERMODYNAMIC ENVIRONMENT OVER THE
   SACRAMENTO VALLEY. EFFECTIVE BULK SHEAR AROUND 30 KT SHOULD HELP
   SUSTAIN SOMEWHAT STRONGER UPDRAFTS IF THE OVERALL LIMITED BUOYANCY
   CAN BE OVERCOME. AS SUCH...SOME HAIL AND GUSTY WINDS WILL BE
   POSSIBLE WITH THE STRONGEST STORMS. HOWEVER...MARGINAL NATURE OF
   THREAT PRECLUDES THE NEED FOR A WW.
   
   ..MOSIER/MEAD.. 05/05/2013
   
   
   ATTN...WFO...REV...MFR...STO...EKA...
   
   LAT...LON   39832141 40842226 41092300 41452405 42072382 42042149
               40982041 39401936 38381873 38131895 38251999 39002086
               39832141