WATCHES: Severe Thunderstorm Watch Number 825

WWUS20 KWNS 030554
SEL5
SPC WW 030554
IAZ000-ILZ000-WIZ000-LMZ000-031300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 825
NWS STORM PREDICTION CENTER NORMAN OK
1250 AM CDT SAT SEP 3 2011

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

NORTHEAST IOWA
FAR NORTHERN ILLINOIS
SOUTHERN WISCONSIN
LAKE MICHIGAN

EFFECTIVE THIS SATURDAY MORNING FROM 1250 AM UNTIL 800 AM CDT.

HAIL TO 1 INCH 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 35
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 70 MILES WEST OF
DUBUQUE IOWA TO 5 MILES NORTH NORTHEAST OF RACINE WISCONSIN. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU5).

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 824...

DISCUSSION...SIMILAR TO FRIDAY MORNING...SETUP AGAIN APPEARS
FAVORABLE FOR SMALL CLUSTERS OF STRONG...SLIGHTLY ELEVATED STORMS.
ASSOCIATED FORWARD-PROPAGATING SEGMENTS WILL BE CAPABLE OF SPORADIC
DMGG WIND GIVEN 30+ KT UNIDIRECTIONAL WSWLY MID LVL FLOW. WHILE
MEAN FLOW APPEARS TO BE SLIGHTLY REDUCED RELATIVE TO EARLY
FRIDAY...COMBINATION OF EVEN MODERATE DEEP UNIDIRECTIONAL WIND FIELD
WITH PW AOA 1.75 INCHES AND RELATIVELY STEEP MID LVL LAPSE RATES MAY
SUPPORT PERSISTENCE OF EXISTING STORM CLUSTERS...AND PERHAPS
ADDITIONAL DEVELOPMENT OVER ERN IA...THROUGH LATER THIS MORNING.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION
VECTOR 26030.

...CORFIDI

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