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Mesoscale Discussion 87
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   MESOSCALE DISCUSSION 0087
   NWS STORM PREDICTION CENTER NORMAN OK
   0131 AM CST WED JAN 30 2013
   
   AREAS AFFECTED...NRN AL AND MIDDLE TN
   
   CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY 
   
   VALID 300731Z - 300800Z
   
   PROBABILITY OF WATCH ISSUANCE...80 PERCENT
   
   SUMMARY...A TORNADO WATCH WILL BE COORDINATED WITH THE AFFECTED
   WFO/S IN NRN AL AND MIDDLE TN SHORTLY.
   
   DISCUSSION...AT 0715Z...REGIONAL RADAR IMAGERY SHOWED A QLCS
   EXTENDING FROM WRN KY THROUGH WRN TN AND INTO NORTH CENTRAL TO WRN
   MS. THIS ACTIVITY WAS TRACKING EWD AT 35-40 KT...WHILE INDIVIDUAL
   EMBEDDED CELLS AND LINES/BOWING SEGMENTS WERE MOVING NEWD AT 50-60
   KT. TWO LONG-LIVED...POTENTIAL TORNADIC SUPERCELLS ARE CURRENTLY /AS
   OF 0715Z/ MERGING WITH THE EWD MOVING QLCS. SLY LOW LEVEL WINDS WILL
   CONTINUE TO STRENGTHEN ACROSS NRN AL AND MIDDLE TN DURING THE
   OVERNIGHT INTO THE EARLY MORNING AS A DEEP UPPER TROUGH ADVANCES E
   ACROSS THE PLAINS...WITH WSR-88D AT COLUMBUS MS ALREADY INDICATING
   SLY WIND SPEEDS AROUND 70 KT AT 1 KM AGL.  THIS IS RESULTING IN
   STRONG LOW LEVEL SHEAR /SFC-1 KM SHEAR OF 40-50 KT/.  
   
   REGIONAL RADAR IMAGERY ALSO INDICATED ADDITIONAL CONVECTION
   DEVELOPING AHEAD OF THE LINE IN NERN MS AND PARTS OF AL WHERE
   INHIBITION IS WEAKENING WITH CONTINUED DESTABILIZATION PER INFLUX OF
   MOISTURE.  THUS...IN ADDITION TO DAMAGING WINDS...A TORNADO CANNOT
   BE RULED OUT.
   
   ..PETERS/MEAD.. 01/30/2013
   
   ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
   
   ATTN...WFO...MRX...FFC...LMK...OHX...BMX...HUN...
   
   LAT...LON   33518818 34968803 35088719 36638608 36588466 35008555
               33388557 33268700 33378801 33518818 
   
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