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Mesoscale Discussion 939
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   MESOSCALE DISCUSSION 0939
   NWS STORM PREDICTION CENTER NORMAN OK
   1231 PM CDT MON JUN 08 2015

   AREAS AFFECTED...MOST OF PA

   CONCERNING...SEVERE POTENTIAL...WATCH LIKELY 

   VALID 081731Z - 081930Z

   PROBABILITY OF WATCH ISSUANCE...80 PERCENT

   SUMMARY...SCATTERED DISCRETE STORMS SHOULD POSE A RISK FOR A COUPLE
   TORNADOES ALONG WITH ISOLATED DAMAGING WINDS AND MARGINAL HAIL.
   CONVECTION MAY EVENTUALLY GROW UPSCALE TOWARDS EARLY EVENING WITH A
   PREDOMINANT WIND RISK.

   DISCUSSION...SEVERAL DISCRETE SHOWERS AND ISOLATED TSTMS HAVE
   DEVELOPED ACROSS PARTS OF SWRN TO CNTRL PA. SURFACE WINDS ARE VEERED
   W OF A TROUGH THAT EXTENDS ROUGHLY FROM TIOGA TO FULTON COUNTIES AS
   OF 17Z. THIS TROUGH AND THE AREA JUST E OF IT SHOULD BE THE MAIN
   CORRIDOR FOR A TORNADO RISK...ESPECIALLY WITH NRN EXTENT WHERE
   LOW-LEVEL HODOGRAPHS ARE ENLARGED WITH AROUND 40-KT 0-1 KM SHEAR PER
   BGM VWP DATA. WITH TIME...MORNING CAMS FAVOR CONSOLIDATION OF STORMS
   BY LATE AFTERNOON. AMIDST STRONG 700-MB SWLYS...THE RISK FOR
   DAMAGING WINDS MAY INCREASE TOWARDS ERN PA.

   ..GRAMS/HART.. 06/08/2015


   ATTN...WFO...PHI...BGM...CTP...LWX...PBZ...

   LAT...LON   41617726 41557678 41297534 40977519 40357544 39937582
               39607639 39537759 39717968 39918006 40557960 41607829
               41617726 

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Page last modified: June 08, 2015
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