WATCHES: Severe Thunderstorm Watch Number 494

WWUS20 KWNS 211931
SEL4
SPC WW 211931
MIZ000-WIZ000-LMZ000-LSZ000-220400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 494
NWS STORM PREDICTION CENTER NORMAN OK
225 PM CDT WED AUG 21 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
UPPER MICHIGAN
NORTHERN AND CENTRAL WISCONSIN
LAKE MICHIGAN
LAKE SUPERIOR

* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 225 PM
UNTIL 1100 PM CDT.

* PRIMARY THREATS INCLUDE...
SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2
INCHES IN DIAMETER POSSIBLE
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
A FEW TORNADOES POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 120
STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH OF
MARQUETTE MICHIGAN TO 35 MILES SOUTH SOUTHWEST OF MOSINEE
WISCONSIN. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

DISCUSSION...TSTMS NOW FORMING ALONG NW WI/WRN UPR MI COLD FRONT
EXPECTED TO INCREASE IN COVERAGE/STRENGTH THROUGH EARLY THIS EVE AS
SFC HEATING FURTHER DESTABILIZES REGION/ELIMINATES CIN...AND AS AREA
IS GLANCED BY UPR IMPULSE CROSSING WRN ONT. AMPLE WNWLY DEEP SHEAR
WILL EXIST FOR SUSTAINED/STORMS SUPERCELLS/LEWPS CAPABLE OF SVR
HAIL/WIND GIVEN RICH LOW-LVL MOISTURE AND DEEP EML. A TORNADO OR TWO
CANNOT BE RULED OUT...ESPECIALLY IN UPR MI AND NRN WI WHERE LOW-LVL
SHEAR MAY BE LOCALLY ENHANCED NEAR INTERSECTION OF FRONT WITH
WSW-ENE BOUNDARY ASSOCIATED WITH OVERNIGHT STORMS IN ND/MN.

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 550. MEAN STORM
MOTION VECTOR 28030.


...CORFIDI

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