Tornado Alley (PROG)

[F6]

Particularly Dangerous Situation (PDS) Tornado Watch 356


Current Radar [refresh this post for latest]


Current Warnings [refresh this post for latest]

    SEL6 
     
    URGENT - IMMEDIATE BROADCAST REQUESTED 
    TORNADO WATCH NUMBER 356 
    NWS STORM PREDICTION CENTER NORMAN OK 
    1250 PM CDT TUE MAY 24 2011 
     
    THE NWS STORM PREDICTION CENTER HAS ISSUED A 
    TORNADO WATCH FOR PORTIONS OF  
     
           WESTERN AND CENTRAL OKLAHOMA 
           NORTHWEST AND NORTH-CENTRAL TEXAS 
     
    EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL 
    1000 PM CDT. 
     
    ...THIS IS A PARTICULARLY DANGEROUS SITUATION... 
     
    NUMEROUS TORNADOES 
    INTENSE TORNADOES LIKELY 
    SCATTERED DAMAGING WINDS 
    WIND GUSTS TO 70 MPH LIKELY 
    WIDESPREAD LARGE HAIL 
    HAIL TO 3.0 INCHES IN DIAMETER LIKELY 
     
    THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE 
    MILES EAST AND WEST OF A LINE FROM 45 MILES WEST NORTHWEST OF 
    PONCA CITY OKLAHOMA TO 25 MILES SOUTH SOUTHWEST OF FORT WORTH 
    TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED 
    WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6). 
     
    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 352...WW 354...WW 355... 
     
    DISCUSSION...TSTM INITIATION IS ANTICIPATED WITHIN THE NEXT HOUR OR 
    TWO ALONG THE DRYLINE FROM WRN OK INTO W-CNTRL TX.  STRONG HEIGHT 
    FALLS/DYNAMIC FORCING FOR ASCENT ASSOCIATED WITH NEGATIVELY TILTED 
    MIDLEVEL TROUGH EMERGING INTO THE PLAINS SHOULD SUPPORT A RAPID 
    INCREASE IN STORM COVERAGE THROUGH THE AFTERNOON.  WARM SECTOR AIR 
    MASS IS CHARACTERIZED BY A VERY MOIST BOUNDARY LAYER WITH DEWPOINTS 
    IN THE UPPER 60S TO LOWER 70S.  WHEN COUPLED WITH STEEP MIDLEVEL 
    LAPSE RATES...ENVIRONMENT IS MODERATELY TO STRONGLY UNSTABLE WITH 
    MLCAPE VALUES OF 2500-4000 J/KG.  DEEP-LAYER SHEAR STRENGTHENING TO 
    40-50 KT WILL PROMOTE RAPID SUPERCELL DEVELOPMENT WITH THE INITIAL 
    HAZARD BEING VERY LARGE HAIL.  INITIAL VEER-BACK WIND PROFILE 
    OBSERVED IN CURRENT VADS/PROFILERS IS EXPECTED TO TRANSITION TO 
    LARGE CLOCKWISE CURVED HODOGRAPHS BY 00Z WHERE 0-1 KM SRH WILL 
    APPROACH 400-500 M2/S2.  AS SUCH...EXPECT A RAPID INCREASE IN THE 
    THREAT FOR TORNADOES THIS AFTERNOON INTO EVENING...SOME OF WHICH 
    COULD BE LONG-TRACKED AND STRONG TO VIOLENT. 
     
    AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL 
    SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE 
    WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 
    550. MEAN STORM MOTION VECTOR 23035. 
        
    ...MEAD 
 

http://www.spc.noaa.gov/products/watch/ww0356.html


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Current Convective Watches

http://www.spc.noaa.gov/products/watch/

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Severe Weather and Flash Flood Warnings
http://kamala.cod.edu/svr/


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related Mesoscale Discussion, current/previous Day 1 Convective Outlooks and Public Severe Weather Outlooks, and my repeated recommendation to let folks you know in the high/moderate risk area know that this is not just another day, in the several posts preceding this one

(not looking good for that nap -- . . .)