Replies to post #136427 on Tornado Alley (PROG)

[F6]

Particularly Dangerous Situation (PDS) Tornado Watch 120





Hazard - Likelihood
Tornadoes - High
EF2+ Tornadoes - Moderate
Severe Wind - High
65 kt+ Wind - Moderate
Severe Hail - High
2"+ Hail - High

Note: The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports [ http://www.spc.noaa.gov/products/watch/ws0120.html ].

    SEL0 
     
    URGENT - IMMEDIATE BROADCAST REQUESTED 
    TORNADO WATCH NUMBER 120 
    NWS STORM PREDICTION CENTER NORMAN OK 
    320 PM CDT SUN APR 10 2011 
     
    THE NWS STORM PREDICTION CENTER HAS ISSUED A 
    TORNADO WATCH FOR PORTIONS OF  
     
           PARTS OF NORTHEAST IOWA 
           PARTS OF WESTERN NORTHERN MICHIGAN 
           SMALL PART OF SOUTHEAST MINNESOTA 
           MUCH OF WISCONSIN 
           LAKE SUPERIOR 
     
    EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 320 PM UNTIL 
    1100 PM CDT. 
     
    ...THIS IS A PARTICULARLY DANGEROUS SITUATION... 
     
    NUMEROUS TORNADOES 
    INTENSE TORNADOES LIKELY 
    WIDESPREAD DAMAGING WINDS 
    WIND GUSTS TO 70 MPH LIKELY 
    WIDESPREAD LARGE HAIL 
    HAIL TO 4.0 INCHES IN DIAMETER LIKELY 
     
    THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 105 STATUTE 
    MILES EAST AND WEST OF A LINE FROM 5 MILES NORTH NORTHWEST OF 
    IRONWOOD MICHIGAN TO 45 MILES SOUTH OF CAMP DOUGLAS WISCONSIN.  
    FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH 
    OUTLINE UPDATE (WOUS64 KWNS WOU0). 
     
    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. 
     
    DISCUSSION...RAPID DEVELOPMENT OF SEVERE SUPERCELL THUNDERSTORMS 
    IMMINENT ALONG THE COLD FRONT FROM WI/MN BORDER INTO NERN IA.  AIR 
    MASS HAS DESTABILIZED AHEAD OF FRONT WITH MLCAPES TO 2000 
    J/KG...COUPLED WITH A VERY INTENSE WIND FIELD WILL LEAD TO POTENTIAL 
    OF BOTH VERY LARGE HAIL AND TORNADOS WITH ANY SUPERCELL.  THERE IS 
    THE THREAT OF LONG LIVED SUPERCELLS ALONG WITH STRONG/DAMAGING 
    TORNADOES. 
     
    AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL 
    SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE 
    WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 
    500. MEAN STORM MOTION VECTOR 24050. 
        
    ...HALES

http://www.spc.noaa.gov/products/watch/ww0120.html [graphics will update]