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Tornado Watch 78
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WW0078 Radar
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   SEL8
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 78
   NWS STORM PREDICTION CENTER NORMAN OK
   100 PM CDT FRI MAR 27 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          EXTREME SOUTHWEST ARKANSAS
          EXTREME SOUTHEAST OKLAHOMA
          NORTHEAST TEXAS
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 100 PM UNTIL 800
   PM CDT.
   
   TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
   GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
   AREAS.
   
   THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE
   MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH OF PARIS TEXAS
   TO 20 MILES WEST SOUTHWEST OF LUFKIN TEXAS.  FOR A COMPLETE
   DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
   (WOUS64 KWNS WOU8).
   
   REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
   TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
   AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
   THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
   AND POSSIBLE WARNINGS.
   
   OTHER WATCH INFORMATION...CONTINUE...WW 76...WW 77...
   
   DISCUSSION...THUNDERSTORMS ARE DEVELOPING IN A BROKEN BAND E OF THE
   SURFACE COLD FRONT AND IN ASSOCIATION WITH A BELT OF ASCENT
   ALOFT...GENERALLY E OF I-45.  CLOUDS...A THUNDERSTORM CLUSTER
   FARTHER S IN SE TX...AND WEAK LOW-LEVEL FLOW HAVE ALL MUDDLED THE
   ENVIRONMENT ACROSS NE TX...WITH PROFILES NOT PARTICULARLY FAVORABLE
   FOR SUPERCELLS AT THE MOMENT.  HOWEVER...AS THE MID LEVEL AND
   SURFACE CYCLONES MOVE EWD ACROSS N TX...LOW-LEVEL SHEAR SHOULD
   GRADUALLY INCREASE OVER NE TX AND THE LOW LEVELS SHOULD DESTABILIZE
   WITHIN SOME CLOUD BREAKS.  BY LATER THIS AFTERNOON...THERE WILL BE
   AN INCREASE IN THE THREAT FOR SUPERCELLS WITH A COUPLE OF
   TORNADOES...IN ADDITION TO THE LARGE HAIL/DAMAGING WIND THREAT.
   
   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
   WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
   450. MEAN STORM MOTION VECTOR 23030.
   
   
   ...THOMPSON
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