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Mesoscale Discussion 135
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   MESOSCALE DISCUSSION 0135
   NWS STORM PREDICTION CENTER NORMAN OK
   1143 PM CST THU FEB 20 2014

   AREAS AFFECTED...CENTRAL AND SRN AL/ERN AND SERN MS/PARTS OF THE WRN
   FL PANHANDLE

   CONCERNING...TORNADO WATCH 15...16...

   VALID 210543Z - 210645Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 15...16...CONTINUES.

   SUMMARY...A NEW WW WILL LIKELY NEED TO BE ISSUED FOR PARTS OF
   CENTRAL/SRN AL AND PART OF THE WRN FL PANHANDLE.  MEANWHILE...THE
   SEVERE WEATHER THREAT WILL CONTINUE ACROSS ERN/SERN MS WITH THE
   THREAT FOR THE JACKSON MS CWA ENDING AROUND OR JUST AFTER 07Z...SUCH
   THAT WW 15 SHOULD BE ALLOWED TO EXPIRE AS SCHEDULED OR BE LOCALLY
   EXTENDED IN TIME.  

   POTENTIAL EXISTS FOR THE SEVERE WEATHER THREAT TO SPREAD EWD INTO
   THE OVERNIGHT PERIOD ACROSS MUCH OF CENTRAL AND SRN AL...ERN AND
   SERN MS AND PART OF THE WRN FL PANHANDLE.

   DISCUSSION...WARM SECTOR ACROSS MUCH OF CENTRAL/SRN AL...ERN AND
   SERN MS INTO THE WRN FL PANHANDLE HAS CONTINUED TO MOISTEN THROUGH
   THE EVENING WITH PW VALUES RANGING FROM 1.2-1.5 INCHES FROM E-W WITH
   MUCAPE RANGING FROM 500-1500 J/KG ACROSS THE DISCUSSION AREA.  DEEP
   LAYER SHEAR HAS ALSO CONTINUED TO STRENGTHEN WITH EFFECTIVE BULK
   SHEAR EXCEEDING 50 KT.  GIVEN DEEP LAYER SHEAR VECTORS ARE ORIENTED
   MORE PERPENDICULAR TO THE ONGOING BANDS OF STORMS IN CENTRAL AL TO
   SERN-SRN MS AND ALSO EWD INTO SRN AL/WRN FL PANHANDLE...MIXED STORM
   MODE WILL REMAIN PROBABLE INTO THE OVERNIGHT.

   ..PETERS/CORFIDI.. 02/21/2014


   ATTN...WFO...TAE...BMX...HUN...MOB...JAN...LIX...

   LAT...LON   30829084 32128937 33448827 34068648 34138548 33258544
               32178529 31158564 30528669 30248831 30829084 

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Page last modified: March 20, 2014
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