Tuesday, April 26, 2011

April 26: PDS Tornado Watch #1


URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 215
   NWS STORM PREDICTION CENTER NORMAN OK
   145 PM CDT TUE APR 26 2011
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          SOUTHERN AND CENTRAL ARKANSAS
          NORTHERN LOUISIANA
          EXTREME SOUTHEAST OKLAHOMA
          NORTHEAST AND NORTH CENTRAL TEXAS
   
   EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 145 PM UNTIL
   1000 PM CDT.
   
   ...THIS IS A PARTICULARLY DANGEROUS SITUATION...
   
   DESTRUCTIVE TORNADOES...LARGE HAIL TO 4 INCHES IN DIAMETER...
   THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE
   POSSIBLE IN THESE AREAS.
   
   THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
   MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTHWEST OF WACO
   TEXAS TO 60 MILES NORTHEAST OF EL DORADO ARKANSAS.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
   UPDATE (WOUS64 KWNS WOU5).
   
   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 213...WW 214...
   
   DISCUSSION...SEVERE THUNDERSTORMS ARE EXPECTED TO RAPIDLY DEVELOP
   THIS AFTERNOON OVER NORTHEAST TX...SPREADING ACROSS THE WATCH AREA
   THROUGH EARLY EVENING.  OTHER INTENSE STORMS WILL DEVELOP BY EARLY
   EVENING OVER NORTHEAST TX AND ALSO SPREAD EASTWARD.  BOTH AREAS OF
   SEVERE STORMS WILL LIKELY INCLUDE DISCRETE SUPERCELLS CAPABLE OF
   VERY LARGE HAIL...DAMAGING WINDS...AND TORNADOES.  WIND FIELDS WILL
   BE STRENGTHENING THROUGH THE EVENING...AND STORMS TRACKING NEAR THE
   EXISTING BOUNDARY FROM TX INTO AR WILL HAVE ENHANCED SHEAR AND THE
   RISK OF STRONG/LONG-LIVED TORNADOES.
   
   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE
   WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
   600. MEAN STORM MOTION VECTOR 25035.

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