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Tornado Watch 91
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WW0091 Radar
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   SEL1
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 91
   NWS STORM PREDICTION CENTER NORMAN OK
   220 PM CDT SAT MAR 28 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          NORTHERN ALABAMA
          EXTREME SOUTHEAST ILLINOIS
          PARTS OF WESTERN AND CENTRAL KENTUCKY
          MIDDLE TENNESSEE
   
   EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 220 PM UNTIL
   900 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 65 STATUTE
   MILES EAST AND WEST OF A LINE FROM 75 MILES NORTH OF FORT
   CAMPBELL KENTUCKY TO 30 MILES SOUTH SOUTHEAST OF HUNTSVILLE
   ALABAMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).
   
   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 89...WW 90...
   
   DISCUSSION...SURFACE HEATING HAS RESULTED IN DESTABILIZATION IN
   ADVANCE OF A SURFACE COLD FRONT NOW MOVING EWD ACROSS WRN TN/MS...TO
   THE SE OF THE SYNOPTIC CYCLONE APPROACHING SE MO AND S OF A WARM
   FRONT LIFTING SLOWLY NWD TOWARD THE OH RIVER.  THUNDERSTORM
   DEVELOPMENT WILL BECOME MORE PROBABLE IN THE NEXT FEW HOURS AS
   MLCAPE INCREASES TO THE 500-1000 J/KG RANGE AND CONVECTIVE
   INHIBITION WEAKENS.  AT THE SAME TIME...STRONG DEEP LAYER VERTICAL
   WILL BE MAINTAINED OVER THE WARM SECTOR ON THE NOSE OF THE 80 KT MID
   LEVEL JET...AND LOW-LEVEL HODOGRAPH CURVATURE WILL BE FAVORABLE FOR
   RIGHT-MOVING SUPERCELLS.  THE COMBINATION OF MODEST INSTABILITY AND
   STRONG VERTICAL SHEAR APPEARS FAVORABLE FOR A BROKEN BAND OF
   SUPERCELLS CAPABLE OF PRODUCING A FEW TORNADOES...ALONG WITH LARGE
   HAIL AND DAMAGING WINDS.  THE SEVERE THREAT SHOULD INCREASE THROUGH
   THE AFTERNOON...AND THEN GRADUALLY DIMINISH AFTER SUNSET AS THE
   BOUNDARY LAYER STABILIZES.
   
   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 24040.
   
   
   ...THOMPSON
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