Tornado Alley (PROG)

[F6]

Particularly Dangerous Situation (PDS) Tornado Watch 135

    SEL5 
     
    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... 
     
    NUMEROUS TORNADOES 
    INTENSE TORNADOES LIKELY 
    WIDESPREAD DAMAGING WINDS 
    ISOLATED WIND GUSTS TO 80 MPH POSSIBLE 
    WIDESPREAD LARGE HAIL 
    HAIL TO 4.0 INCHES IN DIAMETER LIKELY 
     
    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. 
     
     
    ...HALES

http://www.spc.noaa.gov/products/watch/ww0135.html [images will update/stay current]

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