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Mesoscale Discussion 391
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   MESOSCALE DISCUSSION 0391
   NWS STORM PREDICTION CENTER NORMAN OK
   1245 AM CDT MON APR 20 2015

   AREAS AFFECTED...MIDDLE TN/NORTHERN AL/FAR SOUTHEAST KY AND PORTIONS
   OF MS

   CONCERNING...TORNADO WATCH 84...

   VALID 200545Z - 200715Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 84 CONTINUES.

   SUMMARY...LOCALLY DAMAGING WINDS REMAINS A CONCERN WITH AN
   EASTWARD-MOVING SQUALL LINE ACROSS MIDDLE TN AND FAR NORTHEAST MS
   INTO NORTHERN AL/FAR SOUTHEAST KY. TORNADO WATCH 84 CONTINUES...BUT
   WILL LIKELY BE CANCELLED PRIOR TO 08Z. CONVECTIVE TRENDS ARE BEING
   CLOSELY MONITORED FOR A POSSIBLE WATCH ISSUANCE TO THE EAST OF WW
   84.

   DISCUSSION...POTENTIALLY AIDED BY AN MCV...A SQUALL LINE CONTINUES
   TO MAKE A STEADY EAST-NORTHEASTWARD PROGRESSION EARLY IN THE
   OVERNIGHT ACROSS MIDDLE TN AND NORTHEAST MS INTO NORTHERN AL. CLOUD
   TOPS HAVE GENERALLY SHOWN SOME SIGNS OF WARMING PER INFRARED
   SATELLITE IMAGERY...WHILE PRE-SQUALL LINE SURFACE OBSERVATIONS
   CONTINUE TO SHOW A STEADY COOLING WITH SURFACE TEMPERATURES IN THE
   LOWER 60S F AS OF 05Z. WHILE MODEST/INCREASINGLY STABLE NEAR-SURFACE
   INFLOW SHOULD LEAD TO DIMINISHING CONVECTIVE INTENSITY TREND OVER
   THE NEXT COUPLE OF HOURS...THE EXISTING ORGANIZATION/FORWARD MOTION
   OF THE LINE COULD YET ACCOUNT FOR SOME STRONG/NEAR-SEVERE CALIBER
   WIND GUSTS OVERNIGHT.

   ..GUYER.. 04/20/2015


   ATTN...WFO...LMK...OHX...BMX...HUN...PAH...MEG...JAN...

   LAT...LON   36078750 36818707 36318515 34108677 31968947 34478827
               36078750 

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