PDS Tornado Watch #135

URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 135
   NWS STORM PREDICTION CENTER NORMAN OK
   230 PM CDT THU APR 14 2011
  
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF
  
          MUCH OF THE EASTERN HALF OF OKLAHOMA
          PARTS OF NORTH CENTRAL/NORTHEASTERN TEXAS
  
   EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 230 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 EAST AND WEST OF A LINE FROM 15 MILES NORTH NORTHEAST OF
   BARTLESVILLE OKLAHOMA TO 40 MILES SOUTH SOUTHEAST OF SHERMAN
   TEXAS.  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 134...
  
   DISCUSSION...DRY LINE LOCATED VICINITY I-35 CORRIDOR WITH THE AIR
   MASS NOW VERY UNSTABLE EWD ACROSS OK.  WITH LITTLE REMAINING
   CINH...SEVERE THUNDERSTORMS WILL DEVELOP RAPIDLY OFF THE DRY LINE
   AND MOVE THRU A VERY FAVORABLE ENVIRONMENT FOR SUPERCELLS. INITIALLY
   VERY LARGE HAIL WILL BE THE RISK GIVEN THE STEEP LAPSE RATES AND
   DEEP LAYER SHEAR.  AS THE STRONG UPPER JET MAX APPROACHES TORNADIC
   SUPERCELLS WILL BECOME MORE LIKELY BY LATER  THIS AFTERNOON/EVENING
   WITH POTENTIAL FOR LONG LIVED SUPERCELLS AND STRONG TORNADOES.  DRY
   LINE VERY LIKELY WILL MOVE LITTLE EWD FROM CURRENT POSITION WITH
   POTENTIAL FOR SEVERE STORMS DEVELOPING ON W EDGE OF WATCH INTO THE
   EVENING HOURS.
  
   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
   550. MEAN STORM MOTION VECTOR 24035