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Severe Thunderstorm Watch 231
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WW0231 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Moderate Low

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL1
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 231
   NWS STORM PREDICTION CENTER NORMAN OK
   510 AM CDT SUN MAY 3 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          CENTRAL AND NORTHERN LOUISIANA
          EASTERN TEXAS
   
   EFFECTIVE THIS SUNDAY MORNING FROM 510 AM UNTIL 1100 AM CDT.
   
   HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
   MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 105
   STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTHEAST OF
   HUNTSVILLE TEXAS TO 30 MILES NORTH OF SHREVEPORT LOUISIANA.  FOR
   A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU1).
   
   REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
   FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
   DO PRODUCE TORNADOES.
   
   DISCUSSION...SMALL LINE OF ELEVATED TSTMS OVER CENTRAL TX AT 10Z IS
   MOVING EWD AT NEAR 50 KT AND SHOULD BEGIN INGESTING RICHER GULF
   MOISTURE AS IT OVERSPREADS WARM SECTOR WITHIN THE HOUR OVER ERN TX. 
   AIR MASS REMAINS MODERATELY UNSTABLE WITHIN WARM SECTOR...WITH WEAK
   CAPPING...AHEAD OF POTENT SHORTWAVE TROUGH EJECTING ACROSS TX. 
   STORMS MAY EVOLVE INTO A BOW ECHO AND RACE EWD INVOF STALLED SURFACE
   OUTFLOW BOUNDARY/FRONT EXTENDING ACROSS ERN TX AND CENTRAL LA
   THROUGH THE MORNING...WITH EVENTUAL BACKBUILDING ALONG COMPOSITE
   OUTFLOW INTO SERN TX.  MARGINALLY SEVERE HAIL MAY ACCOMPANY ELEVATED
   STORMS...ALTHOUGH WIND DAMAGE MAY BECOME PARAMOUNT AS STORMS ROOT
   NEARER THE SURFACE THROUGH THE MORNING.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 26040.
   
   
   ...EVANS
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Page last modified: May 03, 2009
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