WATCHES: Severe Thunderstorm Watch Number 504

WWUS20 KWNS 301909
SEL4
SPC WW 301909
ILZ000-INZ000-MIZ000-WIZ000-LHZ000-LMZ000-310200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 504
NWS STORM PREDICTION CENTER NORMAN OK
210 PM CDT FRI AUG 30 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN ILLINOIS
NORTHERN INDIANA
SOUTHERN LOWER MICHIGAN
SOUTHERN WISCONSIN
LAKE HURON
LAKE MICHIGAN

* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 210 PM UNTIL
900 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

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST OF
ROCKFORD ILLINOIS TO 35 MILES EAST NORTHEAST OF FLINT MICHIGAN.
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...GRADUAL THUNDERSTORM DEVELOPMENT IS ONGOING NEAR A
SLOWLY SOUTHEASTWARD-MOVING COLD FRONT...WHERE A MOIST BOUNDARY
LAYER CONTINUES TO HEAT/DESTABILIZE. AS INSTABILITY MAXIMIZES OVER
THE NEXT COUPLE OF HOURS...STORMS ARE EXPECTED TO CONTINUE
INCREASING IN COVERAGE AND INTENSITY -- AIDED BY MODERATE
NORTHWESTERLY FLOW ALOFT. THE STRONGEST CELLS WILL BE CAPABLE OF
PRODUCING LARGE HAIL AND LOCALLY DAMAGING WINDS AS THEY SHIFT
SOUTHEASTWARD INTO THE EVENING HOURS.

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 28030.


...GOSS

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