WATCHES: Severe Thunderstorm Watch Number 504

WWUS20 KWNS 202018
SEL4
SPC WW 202018
WIZ000-LMZ000-210200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 504
NWS STORM PREDICTION CENTER NORMAN OK
320 PM CDT TUE JUL 20 2010

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

CENTRAL WISCONSIN
LAKE MICHIGAN

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 320 PM UNTIL
900 PM CDT.

HAIL TO 2 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 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES SOUTHWEST
OF EAU CLAIRE WISCONSIN TO 50 MILES EAST NORTHEAST OF GREEN BAY
WISCONSIN. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).

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 502...WW 503...

DISCUSSION...ISOLATED THUNDERSTORMS ARE INCREASING ACROSS CENTRAL WI
NEAR LEFT EXIT REGION OF MID/UPPER LEVEL JET. COOL TEMPERATURES
ALOFT AND STEEP LAPSE RATES...COUPLED WITH FAVORABLE EFFECTIVE SHEAR
VALUES...WILL POSE A RISK OF LARGE HAIL IN STRONGER STORMS THROUGH
MID EVENING. STORMS SHOULD DIMINISH RAPIDLY AFTER DARK.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 30025.

...HART

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