WATCHES: Severe Thunderstorm Watch Number 204

WWUS20 KWNS 302142
SEL4
SPC WW 302142
IAZ000-MNZ000-WIZ000-010500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 204
NWS STORM PREDICTION CENTER NORMAN OK
445 PM CDT MON APR 30 2007

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

NORTHEAST IOWA
SOUTHEAST MINNESOTA
SOUTHWEST WISCONSIN

EFFECTIVE THIS MONDAY AFTERNOON FROM 445 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 55
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES NORTH
NORTHWEST OF MASON CITY IOWA TO 30 MILES EAST OF LONEROCK
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 202...WW 203...

DISCUSSION...THUNDERSTORMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY THIS EVENING ACROSS SOUTHEAST MN AND TRACK
EAST-SOUTHEASTWARD INTO SOUTHWEST WI. OTHER MORE ISOLATED STORMS
ARE POSSIBLE ACROSS NORTHEAST IA ALONG AND NORTH OF SURFACE WARM
FRONT. FAVORABLE DEEP LAYER VERTICAL SHEAR PROFILES AND SUFFICIENT
CAPE WILL PROMOTE A RISK OF SUPERCELLS CAPABLE OF LARGE HAIL AND
DAMAGING WINDS.

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 27030.

..HART

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