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Severe Thunderstorm Watch 56
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WW0056 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Low Low
Severe Hail 2"+ Hail
Moderate Moderate

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL6
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 56
   NWS STORM PREDICTION CENTER NORMAN OK
   545 PM CDT TUE MAR 19 2013
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          PARTS OF CENTRAL AND SOUTHEAST TEXAS
   
   EFFECTIVE THIS TUESDAY AFTERNOON FROM 545 PM UNTIL MIDNIGHT CDT.
   
   HAIL TO 2 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 55
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 125 MILES WEST
   NORTHWEST OF AUSTIN TEXAS TO 30 MILES SOUTH SOUTHEAST OF COLLEGE
   STATION TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).
   
   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...THUNDERSTORM DEVELOPMENT IS UNDERWAY ACROSS CENTRAL TX
   NEAR THE INTERSECTION OF A DIFFUSE TROUGH/DRYLINE AND WNW-ESE
   ORIENTED SURFACE FRONT.  THE AIR MASS S OF THE FRONT IS MODERATELY
   UNSTABLE WITH BOUNDARY LAYER DEWPOINTS IN THE MID-UPPER 50S AND
   TEMPERATURES IN THE LOW-MID 80S...WHICH IS DRIVING MLCAPE AROUND
   1500 J/KG.  MEANWHILE...WATER VAPOR IMAGERY SHOWS THE APPROACH OF A
   MID-UPPER JET STREAK MOVING FROM NM INTO W CENTRAL TX...AND ASCENT
   IN THE EXIT REGION OF THIS JET STREAK WILL OVERSPREAD CENTRAL TX
   THIS EVENING.  THUS...THUNDERSTORMS ARE EXPECTED TO INCREASE IN
   COVERAGE/INTENSITY THIS EVENING...IN AN ENVIRONMENT WITH SUFFICIENT
   DEEP-LAYER VERTICAL SHEAR FOR SUPERCELLS.  LARGE HAIL WILL BE THE
   PRIMARY SEVERE THREAT WITH THE INITIAL SUPERCELLS...AND THE RISK FOR
   A FEW DAMAGING GUSTS WILL DEPEND MORE ON UPSCALE GROWTH INTO A
   CLUSTER THROUGH STORM MERGERS.
   
   AVIATION...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 500. MEAN STORM
   MOTION VECTOR 30025.
   
   
   ...THOMPSON
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