423
WWUS20 KWNS 161853
SEL6
SPC WW 161853
ILZ000-INZ000-WIZ000-LMZ000-170000-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 596
NWS STORM PREDICTION CENTER NORMAN OK
155 PM CDT SAT AUG 16 2025
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN ILLINOIS
FAR NORTHWEST INDIANA
FAR SOUTHEAST WISCONSIN
LAKE MICHIGAN
* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 155 PM UNTIL
700 PM CDT.
* PRIMARY THREATS INCLUDE...
SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
SCATTERED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE
SUMMARY...THUNDERSTORM CLUSTER CURRENTLY ONGOING OVER FAR SOUTHEAST
WI IS EXPECTED TO CONTINUE SOUTHEASTWARD THROUGH NORTHERN IL AND
NORTHWEST IN THIS AFTERNOON AND EVENING. THE AIRMASS IN THESE AREAS
IS VERY UNSTABLE AND SUPPORTIVE OF ROBUST UPDRAFTS CAPABLE OF LARGE
HAIL AND DAMAGING GUSTS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHEAST
OF JANESVILLE WI TO 45 MILES WEST OF VALPARAISO IN. FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU6).
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.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO
1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A
FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR
29030.
...MOSIER
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