[LeArc] SEVERE THUNDERSTORM WATCH NUMBER 163

[Duane Whittingham]

URGENT - IMMEDIATE BROADCAST REQUESTED
    SEVERE THUNDERSTORM WATCH NUMBER 163
    NWS STORM PREDICTION CENTER NORMAN OK
    120 PM CDT SUN APR 22 2007

    THE NWS STORM PREDICTION CENTER HAS ISSUED A
    SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

           CENTRAL AND EASTERN IOWA
           WESTERN ILLINOIS
           NORTHEAST MISSOURI
           SOUTHWEST WISCONSIN

    EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 120 PM UNTIL 900
    PM CDT.

    HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
    MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

    THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75
    STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES EAST
    NORTHEAST OF MASON CITY IOWA TO 15 MILES SOUTH OF QUINCY
    ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
    ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

    REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
    FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
    DO PRODUCE TORNADOES.

    OTHER WATCH INFORMATION...CONTINUE...WW 162...

    DISCUSSION...BAND OF SLIGHTLY ELEVATED TSTMS IN CNTRL/N CNTRL MO MAY
    INCREASE IN INTENSITY AND BECOME MORE NEARLY SFC-BASED IN THE NEXT
    COUPLE OF HOURS AS ACTIVITY ENCOUNTERS HEATED LOW-LEVEL ENVIRONMENT
    E OF BAND.  WIND FIELD AND LARGE SCALE ASCENT OVER REGION WILL
    STRENGTHEN WITH CONTINUED ENE EJECTION OF NEB UPR LOW.  OVERALL
    SETUP MAY SUPPORT DEVELOPMENT OF DAMAGING WIND GUSTS...HAIL AND
    POSSIBLY AN ISOLATED TORNADO WITH EMBEDDED SUSTAINED/SUPERCELL
    STORMS.

    AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
    TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
    KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
    MOTION VECTOR 22040.


    ...CORFIDI


ILLINOIS COUNTIES INCLUDED ARE

ADAMS                BROWN               CASS
FULTON               HANCOCK             HENDERSON
HENRY                KNOX                MASON
MCDONOUGH            MERCER              MORGAN
PIKE                 ROCK ISLAND         SCHUYLER
SCOTT                WARREN