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Mesoscale Discussion 910
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   MESOSCALE DISCUSSION 0910
   NWS STORM PREDICTION CENTER NORMAN OK
   0436 PM CDT MON JUN 01 2009
   
   AREAS AFFECTED...SRN MI...W-CENTRAL/NWRN OH
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 012136Z - 012230Z
   
   CONTINUING TO MONITOR ONGOING CLUSTER OF STORMS NOW OVER SRN LAKE MI
   INTO NRN/CENTRAL IND FOR SVR PTNL SPREADING DOWNSTREAM INTO FAR SRN
   MI AND PORTIONS OF OH THIS EVENING.
   
   NOSE OF MODERATE INSTABILITY/SURFACE HEATING EXTENDS INTO SWRN OH AT
   21Z...WITH INSTABILITY DIMINISHING WITH N AND E EXTENT.  ALTHOUGH
   DEEP LAYER SHEAR REMAINS FAIRLY STRONG WITH EFFECTIVE SHEAR
   GENERALLY FROM 40-50 KT ACROSS THIS AREA...ONGOING ACTIVITY HAS YET
   TO ORGANIZE.  THE LACK OF STORM-SCALE ORGANIZATION RAISES QUESTIONS
   ABOUT SEVERITY OF ACTIVITY SPREADING DOWNSTREAM THIS EVENING. 
   HOWEVER...OVERALL ENVIRONMENT WOULD CERTAINLY SUPPORT A MORE
   PERSISTENT SEVERE THREAT AHEAD OF SURFACE COLD FRONT PUSHING SEWD
   ACROSS LOWER MI/NWRN IND ATTM.
   
   ..EVANS.. 06/01/2009
   
   
   ATTN...WFO...CLE...ILN...DTX...IWX...GRR...
   
   LAT...LON   41498250 40048310 39958471 42118485 42178319 41498250 
   
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