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Mesoscale Discussion 77
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   MESOSCALE DISCUSSION 0077
   NWS STORM PREDICTION CENTER NORMAN OK
   0458 PM CST TUE JAN 29 2013
   
   AREAS AFFECTED...AR...NERN TX...FAR NRN LA
   
   CONCERNING...TORNADO WATCH 7...9...
   
   VALID 292258Z - 300030Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 7...9...CONTINUES.
   
   SUMMARY...WITH WW 7 SCHEDULED TO EXPIRE AT 01Z...PORTIONS OF THIS
   AND WW 9 WILL BE EFFECTIVELY REPLACED BY A NEW TORNADO WATCH WITHIN
   THE NEXT HALF-HOUR...AS SEVERE POTENTIAL INCREASES THIS EVENING.
   
   DISCUSSION...SEVERE THREAT WILL INCREASE THIS EVENING AS BOTH QLCS
   AND PRE-FRONTAL TSTMS LIKELY STRENGTHEN. BOTH LARGE-SCALE ASCENT AND
   DEEP-LAYER WIND FIELDS WILL INCREASE SUBSTANTIALLY...SUPPORTING AN
   INCREASING RISK FOR DAMAGING WINDS AS THE QLCS LIKELY ACCELERATES
   EWD DURING THE EVENING. LOW-LEVEL HODOGRAPHS WILL BE VERY FAVORABLE
   FOR TORNADOES /POTENTIALLY SIGNIFICANT/...ESPECIALLY WITH
   SEMI-DISCRETE TSTMS JUST AHEAD OF THE QLCS.
   
   ..GRAMS/HART.. 01/29/2013
   
   ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
   
   ATTN...WFO...MEG...JAN...LZK...SGF...SHV...TSA...FWD...
   
   LAT...LON   36489304 36499141 36369080 35089101 33229198 32459290
               32329425 32379585 32599649 36489304 
   
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