FLUS43 KLOT 222037
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
337 PM CDT Sat Aug 22 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-232045-
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-
337 PM CDT Sat Aug 22 2026 /437 PM EDT Sat Aug 22 2026/

This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.

.DAY ONE...Tonight.

Weather hazards expected...

  Limited Thunderstorm Risk.
  High Swim Risk Lake Michigan Beaches.

DISCUSSION...

Isolated thunderstorms are possible near and south of Lake 
Michigan until early evening. Isolated showers and maybe a 
thunderstorm may persist near the lake in northwest Indiana 
through tonight.

Dangerous swimming conditions at Porter County Lake Michigan 
beaches this afternoon will build west to the Lake County Indiana
and possibly the Cook County Illinois shore late tonight.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Sunday...
  High Swim Risk Lake Michigan Beaches.
Wednesday...
  Limited Thunderstorm Risk.

DISCUSSION...

Dangerous swimming conditions are expected at northwest Indiana
and possibly Cook County Illinois Lake Michigan beaches on 
Sunday.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the south-southeast at 25 mph.

$$

LMZ740>745-232045-
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-
337 PM CDT Sat Aug 22 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...Tonight.

Weather hazards expected...

  Hazardous conditions for small craft.
  Limited Thunderstorm Risk.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Sunday...
  Hazardous conditions for small craft are likely.
Wednesday...
  Limited Thunderstorm Risk.

$$

Doom/Castro

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