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Mesoscale Discussion 84
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   MESOSCALE DISCUSSION 0084
   NWS STORM PREDICTION CENTER NORMAN OK
   0949 PM CST TUE JAN 29 2013
   
   AREAS AFFECTED...WRN/MIDDLE TN...NRN/CNTRL/WRN MS...ERN AR...NERN LA
   
   CONCERNING...TORNADO WATCH 10...
   
   VALID 300349Z - 300545Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 10 CONTINUES.
   
   SUMMARY...COMPOSITE OUTFLOW/COLD FRONT WILL EVENTUALLY OVERTAKE WARM
   SECTOR BAND OF TSTMS ALONG THE MS RIVER. NRN PORTION OF THIS QLCS
   SHOULD ACCELERATE EWD IN TN OVERNIGHT WITH EMBEDDED BOWING
   STRUCTURES CAPABLE OF DAMAGING WINDS AND TORNADOES.
   
   DISCUSSION...CONVECTIVE CHARACTER HAS BEGUN TRANSITIONING TO AN
   ACCELERATING QLCS...PRIMARILY N OF WW 10...REF MCD 0083. THIS QLCS
   SHOULD CONTINUE TO MERGE WITH A PERSISTENT PRE-FRONTAL BAND OF
   SEMI-DISCRETE CONVECTION S/SWWD INTO NERN LA. WHILE...UPSTREAM
   COMPOSITE OUTFLOW/COLD FRONT SHOULD EVENTUALLY OVERTAKE THE SRN
   PORTION OF PRE-FRONTAL CONVECTION IN LA. WITH THESE PROCESSES
   OCCURRING WITHIN AN IMMENSELY SHEARED ENVIRONMENT...THIS SHOULD
   ULTIMATELY YIELD AN EXTENSIVE NNE/SSW-ORIENTED QLCS.
   
   THIS SHOULD TRANSITION A MIXED TORNADO/DAMAGING WIND THREAT TO
   PREDOMINANTLY DAMAGING WINDS AS SEMI-DISCRETE STRUCTURES EVOLVE INTO
   EMBEDDED BOWING SEGMENTS. 850-700 MB FLOW WILL BE STRONGER FROM THE
   TN/MS BORDER LATITUDE NWD...SUGGESTIVE OF MORE WIDESPREAD DAMAGING
   WIND POTENTIAL ACROSS TN. GREATEST RELATIVE TORNADO RISK SHOULD
   PERSIST ALONG THE SRN PORTION /MS/ AS INDIVIDUAL CELLS HAVE
   RELATIVELY LONGER OPPORTUNITY FOR MAINTAINING INGEST OF RICH
   BOUNDARY LAYER MOISTURE.
   
   ..GRAMS.. 01/30/2013
   
   ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
   
   ATTN...WFO...OHX...BMX...HUN...PAH...MEG...JAN...LZK...SHV...
   
   LAT...LON   31519057 33448882 35288699 36268649 36578665 36658860
               36448988 35809056 32499241 31689259 31519057 
   
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