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Mesoscale Discussion 400
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   MESOSCALE DISCUSSION 0400
   NWS STORM PREDICTION CENTER NORMAN OK
   0318 PM CDT MON APR 20 2015

   AREAS AFFECTED...+NE GA...UPSTATE SC...PORTIONS OF WRN NC

   CONCERNING...TORNADO WATCH 88...

   VALID 202018Z - 202115Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 88 CONTINUES.

   SUMMARY...THE TORNADO THREAT WILL CONTINUE ACROSS MOST OF TORNADO
   WATCH 88 THE NEXT FEW HOURS. A NEW DOWNSTREAM TORNADO WATCH MAY BE
   NEEDED ACROSS PORTIONS OF THE COLUMBIA NWS CWA.

   DISCUSSION...THE SEVERE THREAT WILL CONTINUE THE NEXT FEW HOURS
   ACROSS MUCH OF TORNADO WATCH 88. RADAR TRENDS CONTINUE TO INDICATE A
   MIX OF SEMI-DISCRETE SUPERCELLS AND MULTICELL CLUSTERS FROM NE GA
   INTO UPSTATE SC. THIS LINE OF CELLS WILL CONTINUE TO TRACK NORTHEAST
   LATE THIS AFTERNOON. THE DOWNSTREAM AIRMASS CONTINUES TO MAINTAIN
   SBCAPE VALUES NEAR 1500 J/KG. CURRENT SURFACE OBSERVATIONS ALSO
   INDICATE THAT WINDS HAVE BECOME MORE SLY ACROSS CENTRAL SC. OF
   NOTE...THE CAE VWP SHOWS 0-1KM SRH OF 239 M2/S2. AS SUCH...THE
   TORNADO THREAT MAY SPREAD OUTSIDE THE CURRENT WATCH INTO PORTIONS OF
   THE COLUMBIA NWS CWA. A SMALL DOWNSTREAM WATCH MAY BE NEEDED SOON.

   ..LEITMAN/HART.. 04/20/2015


   ATTN...WFO...RAH...RNK...CAE...GSP...FFC...

   LAT...LON   34128402 34778349 35738244 35998195 36058157 35998091
               35928061 35768044 35528039 35088036 34728045 34548052
               34178075 33868132 33598211 33628299 33778363 34128402 

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Page last modified: April 20, 2015
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