MESOSCALE DISCUSSION 0896
   NWS STORM PREDICTION CENTER NORMAN OK
   0524 PM CDT FRI MAY 29 2009
   
   AREAS AFFECTED...NRN ORE/SRN WA EAST OF THE CASCADES INTO NERN ORE
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 292224Z - 292330Z
   
   ISOLATED STRONG WIND GUSTS AND HAIL WILL BE POSSIBLE WITH STORMS
   DEVELOPING OVER NORTH CENTRAL ORE/SRN WA...AND SOME THREAT ALSO
   POSSIBLE OVER NERN ORE.
   
   ASCENT ATTENDANT TO WEAK MID LEVEL IMPULSES TRANSLATING ALONG THE
   NWRN/NRN PERIPHERY OF THE RIDGE CENTERED OVER THE GREAT BASIN WILL
   SUPPORT ADDITIONAL TSTM DEVELOPMENT ACROSS ORE/SRN WA INTO THE NRN
   ROCKIES.  OBJECTIVE ANALYSES INDICATED MODERATE INSTABILITY HAS
   DEVELOPED ALONG AND EAST OF THE ORE/SRN WA CASCADES AND EWD TO NERN
   ORE WHERE STRONG SURFACE HEATING IS RESULTING IN MLCAPE UP TO
   1000-1500 J/KG.  ALTHOUGH LOWER TROPOSPHERIC WINDS ARE RATHER
   WEAK...STRONGER UPPER LEVEL SSWLY WINDS ARE SUPPORTING EFFECTIVE
   BULK SHEAR AROUND 30 KT IN VICINITY OF THE CASCADES.  THIS COMBINED
   WITH MODERATE INSTABILITY SHOULD SUPPORT A FEW ORGANIZED MULTICELL
   STORMS.  STEEP LOW LEVEL LAPSE RATES AND LARGE SURFACE
   TEMPERATURE/DEWPOINT DEPRESSIONS WILL FAVOR STRONG WIND GUSTS...
   WHILE STEEP MID LEVEL LAPSE RATES SUGGEST A THREAT FOR ISOLATED HAIL
   AS WELL.
   
   SHEAR IS WEAKER WITH EWD EXTENT /INTO NERN ORE/ WHICH SHOULD LIMIT
   THE POTENTIAL FOR STORM ORGANIZATION AND OVERALL SEVERE WEATHER
   THREAT.
   
   ..PETERS.. 05/29/2009
   
   
   ATTN...WFO...BOI...PDT...SEW...PQR...
   
   LAT...LON   43802191 45102170 46182151 46692127 46552052 45952020
               45831975 45981841 45671753 44931744 44431833 43652142
               43802191