636
FLUS43 KLOT 211946
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
246 PM CDT Thu Aug 21 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-222000-
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-
246 PM CDT Thu Aug 21 2025 /346 PM EDT Thu Aug 21 2025/

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

.DAY ONE...Tonight.

Weather hazards expected...

  Elevated Fog Risk overnight.

DISCUSSION...

Fog is expected to develop after midnight tonight and persist into
early Friday morning, particularly outside of Chicago. The fog
could become dense and impact travel in some areas through early
Friday morning.


.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday...
  Elevated Fog Risk early in the morning.
Saturday...
  Limited Thunderstorm Risk.


.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

$$

LMZ740>745-222000-
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-
246 PM CDT Thu Aug 21 2025

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.

  No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Saturday...
  Limited Thunderstorm Risk.

$$

KJB

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