Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service Milwaukee/Sullivan WI
122 PM CDT Wed Sep 30 2026
LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-011830-
Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to
mid-line of lake.-
Lake Michigan from Seul Choix Point to Rock Island Passage 5NM
offshore to Mid Lake-
Lake Michigan South of a line from Seul Choix Point to the
Mackinac Bridge and North of a line from Charlevoix MI to South
Fox Island 5NM offshore-
Lake Michigan from Charlevoix to Point Betsie MI 5NM Offshore to
mid lake-
Lake Michigan from Point Betsie to Manistee MI 5NM offshore to
Mid Lake-
Lake Michigan from Rock Island Passage to Sturgeon Bay WI 5NM
offshore to mid lake-
Lake Michigan from Sturgeon Bay to Two Rivers WI 5NM offshore to
Mid Lake-
Lake Michigan from Two Rivers to Sheboygan WI 5NM offshore to Mid
Lake-
Lake Michigan from Sheboygan to Port Washington WI 5NM offshore
to Mid Lake-
Lake Michigan from Port Washington to North Point Light WI 5NM
offshore to Mid Lake-
Lake Michigan from North Point Light to Wind Point WI 5NM
offshore to Mid Lake-
Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM
offshore to Mid Lake-
Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM
offshore to Mid Lake-
Lake Michigan from Wilmette Harbor to Michigan City in 5NM
offshore to Mid Lake-
Lake Michigan from Pentwater to Manistee MI 5NM offshore to Mid
Lake-
Lake Michigan from Whitehall to Pentwater MI 5NM offshore to Mid
Lake-
Lake Michigan from Grand Haven to Whitehall MI 5NM offshore to
Mid Lake-
Lake Michigan from Holland to Grand Haven MI 5NM offshore to Mid
Lake-
Lake Michigan from South Haven to Holland MI 5NM offshore to Mid
lake-
Lake Michigan from St Joseph to South Haven MI 5NM offshore to
Mid Lake-
122 PM CDT Wed Sep 30 2026
This Hazardous Weather Outlook is for the open waters of Lake Michigan.
.DAY ONE...This Afternoon and Tonight
Isolated thunderstorms may occur tonight.
Some fog is expected across the lake.
.DAYS TWO THROUGH SEVEN...Thursday through Tuesday
Isolated thunderstorms may occur into Thursday.
Some fog is expected across the lake into Thursday.
$$
Wood
www.weather.gov/mkx
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1126 AM CDT Wed Sep 30 2026
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-011630-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
1126 AM CDT Wed Sep 30 2026 /1226 PM EDT Wed Sep 30 2026/
This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.
.DAY ONE...This Afternoon and Tonight.
Weather hazards expected...
Limited Flooding Risk.
DISCUSSION...
Waves of rain will persist this afternoon, possibly resulting in
ponding in poor drainage and low-lying areas.
.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.
Thursday...
Elevated Flooding Risk.
Limited Thunderstorm Risk.
DISCUSSION...
An additional wave of rain, heavy at times heavy, is expected
Thursday into Thursday night. This may result in significant
rises and potential flooding on area rivers and streams.
.SPOTTER INFORMATION STATEMENT...
Spotter activation will not be necessary through tonight.
$$
Hydrologic Outlook
Hydrologic Outlook
ILC007-031-037-043-063-089-093-097-099-103-111-141-197-201-INC089-
127-010900-
Hydrologic Outlook
National Weather Service Chicago IL
102 PM CDT Wed Sep 30 2026
...Areas of flooding and significant rises in river levels possible
through late week...
Waves of rain, and possibly a few thunderstorms, will continue
through Thursday night. High moisture content in the atmosphere will
lead to periods of torrential downpours and the threat for 1 to 3
inches of rainfall on a widespread basis through Thursday night.
Repeated rounds of rain over saturated soils may lead to flooding of
low-lying and poor drainage areas as well as rises on area rivers,
including along the Rock, Fox, DuPage, Des Plaines, and Illinois
Rivers.
This outlook means that elevated water levels and potential impacts
are possible, but not yet certain. Persons should closely monitor
forecasts including the possibility of flood watches, warnings, and
advisories.
Additional statements or outlooks may be issued late tonight.
$$
Birk
