Monday, July 18, 2011

WATCHES: Severe Thunderstorm Watch Number 661

WWUS20 KWNS 182316
SEL1
SPC WW 182316
WIZ000-LMZ000-190500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 661
NWS STORM PREDICTION CENTER NORMAN OK
620 PM CDT MON JUL 18 2011

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

SOUTHERN WISCONSIN
LAKE MICHIGAN

EFFECTIVE THIS MONDAY NIGHT FROM 620 PM UNTIL MIDNIGHT 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 75
STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF
MADISON WISCONSIN TO 30 MILES EAST SOUTHEAST OF JANESVILLE
WISCONSIN. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

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 657...WW 658...WW
659...WW 660...

DISCUSSION...A BAND OF STRONG TO SEVERE THUNDERSTORMS OVER CENTRAL
WI WILL SPREAD SOUTHWARD ACROSS THE WATCH AREA THIS EVENING. HIGH
CAPE VALUES AND SUFFICIENT VERTICAL SHEAR WILL PROMOTE ORGANIZED
STORMS CAPABLE OF LOCALLY DAMAGING WINDS AND HAIL.

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 500. MEAN STORM
MOTION VECTOR 31025.


...HART

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