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Mesoscale Discussion 405
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   MESOSCALE DISCUSSION 0405
   NWS STORM PREDICTION CENTER NORMAN OK
   0527 PM CDT MON APR 20 2015

   AREAS AFFECTED...PORTIONS OF VA AND NC

   CONCERNING...SEVERE THUNDERSTORM WATCH 89...

   VALID 202227Z - 210000Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 89
   CONTINUES.

   SUMMARY...SOME SVR RISK PERSISTS ACROSS WW 89.

   DISCUSSION...ISOLATED TO WIDELY SCATTERED STORMS...LOCALLY ORGANIZED
   IN SMALL CLUSTERS...ARE ONGOING ACROSS WW 89 AND WILL CONTINUE
   SPREADING ENEWD/NEWD. WIDESPREAD MID/HIGH CLOUDS HAVE STUNTED
   DIURNAL INCREASES IN LOW-LEVEL LAPSE RATES...THOUGH BOUNDARY-LAYER
   MOISTURE REMAINS ADEQUATE FOR AROUND 750-1000 J/KG OF MLCAPE. STRONG
   MID/HIGH-LEVEL FLOW SAMPLED BY THE RAX VWP BREEDS AMPLE DEEP SHEAR
   AND CONVECTIVE VENTILATION TO MAINTAIN SEMI-ORGANIZED CONVECTIVE
   STRUCTURES WITH MARGINALLY SVR WIND/HAIL POSSIBLE. NOCTURNAL COOLING
   AND THE LACK OF STRONGER DEEP ASCENT SHOULD RESULT IN A DECREASE IN
   CONVECTIVE COVERAGE/INTENSITY THROUGH THE EVENING.

   ..COHEN.. 04/20/2015


   ATTN...WFO...AKQ...LWX...RAH...RNK...

   LAT...LON   35087993 35728005 36148039 36378150 37298046 37587874
               37797667 36727624 36137691 36567786 35337917 35087993 

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