FLUS43 KLOT 210851

HWOLOT



Hazardous Weather Outlook

National Weather Service Chicago/Romeoville IL

351 AM CDT Mon Sep 21 2026



ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-

010-011-019-220900-

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-

351 AM CDT Mon Sep 21 2026 /451 AM EDT Mon Sep 21 2026/



This Hazardous Weather Outlook is for portions of north central

Illinois...northeast Illinois and northwest Indiana.



.DAY ONE...Today and Tonight.



Weather hazards expected...



  High Swim Risk Lake Michigan Beaches.



DISCUSSION...



High waves will lead to dangerous swimming conditions at Lake 

Michigan beaches today.



.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.



Tuesday and Wednesday...

  High Swim Risk Lake Michigan Beaches.



DISCUSSION...



Persistent northeast winds will maintain high waves and dangerous

swimming conditions at southern Lake Michigan beaches through the

middle of this week.



.SPOTTER INFORMATION STATEMENT...



  Spotter activation will not be necessary through tonight.



$$



LMZ740>745-220900-

Winthrop Harbor to Wilmette Harbor IL-

Wilmette Harbor to Northerly Island IL-

Northerly Island to Calumet Harbor IL-

Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-

Burns Harbor to Michigan City IN-

351 AM CDT Mon Sep 21 2026



This Hazardous Weather Outlook is for portions of the Illinois

nearshore waters of Lake Michigan and the Indiana nearshore

waters of Lake Michigan.



.DAY ONE...Today and Tonight.



Weather hazards expected...



  Hazardous conditions for small craft.



.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.



Tuesday and Wednesday...

  Hazardous conditions for small craft are likely.



$$



Ratzer



Visit us at www.weather.gov/chicago