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Mesoscale Discussion 648
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   MESOSCALE DISCUSSION 0648
   NWS STORM PREDICTION CENTER NORMAN OK
   1109 PM CDT WED APR 27 2011
   
   AREAS AFFECTED...ERN AL...CENTRAL AND NRN GA...ERN TN...WRN NC...AND
   UPSTATE SC
   
   CONCERNING...TORNADO WATCH 238...241...
   
   VALID 280409Z - 280445Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 238...241...CONTINUES.
   
   A NEW TORNADO WATCH WILL BE NEEDED FOR PARTS OF THIS REGION GIVEN
   THE EXPIRATION OF WW 241 AT 06Z.  LOCAL WFO EXTENSION OF WW 238 MAY
   BE NEEDED AS THE STORM OVER SEVIER COUNTY TN REACHES FAR NERN TN
   BETWEEN 05-0530Z.
   
   THE LIKELIHOOD FOR DISCRETE SUPERCELLS PRODUCING TORNADOES CONTINUES
   ACROSS THE VALID PORTIONS OF PDS /PARTICULARLY DANGEROUS SITUATION/
   WATCHES 238 AND 241 LATE THIS EVENING INTO THE EARLY OVERNIGHT
   PERIOD.  THIS INCLUDES ERN AL THROUGH CENTRAL AND NRN GA TO FAR ERN
   TN...UPSTATE SC AND WRN NC.
   
   LATE EVENING SURFACE ANALYSIS SHOWED AN AREA OF LOW PRESSURE OVER
   CENTRAL INDIANA WITH A COLD FRONT TRAILING SWD THROUGH MIDDLE TN AND
   NERN AL TO SERN MS.  REGIONAL RADAR IMAGERY INDICATED SEVERAL
   DISCRETE SUPERCELLS ACROSS THE DISCUSSION AREA WITH THIS ACTIVITY
   LOCATED ALONG AT LEAST TWO PRE-FRONTAL WIND SHIFTS/CONVERGENCE
   ZONES.  THE WARM SECTOR REMAINS MODERATELY UNSTABLE FROM NRN GA SWD
   AND MARGINALLY UNSTABLE ACROSS FAR WEST CENTRAL NC.  WRN EXTENT OF
   STRONGER INSTABILITY IN LEE OF THE APPALACHIANS DOES EXIST OVER THE
   NERN PART OF WW 241.  STRONG DEEP LAYER WIND FIELDS REMAIN
   SUPPORTIVE OF SUPERCELLS WITH THE STRENGTH OF THE LLJ /55-70 KT/
   FROM ERN AL/WRN GA TO ERN KY AND WV WILL MAINTAIN STRONG LOW LEVEL
   SHEAR FOR LOW LEVEL ROTATION/TORNADIC THREAT.
   
   ..PETERS.. 04/28/2011
   
   
   ATTN...WFO...RAH...RNK...CAE...GSP...MRX...FFC...TAE...BMX...
   MOB...
   
   LAT...LON   31608612 32698638 34388519 35228437 36588340 36568113
               35968038 34748166 33218330 31928449 31688537 31608612 
   
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Page last modified: April 28, 2011
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