766
FLUS43 KLOT 171643
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1143 AM CDT Sun Aug 17 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-181645-
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-
1143 AM CDT Sun Aug 17 2025 /1243 PM EDT Sun Aug 17 2025/

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...

 High Swim Risk at Southern Lake Michigan Beaches
 Limited Thunderstorm Risk.

DISCUSSION...

Isolated thunderstorms are possible this afternoon mainly west of
a Dixon to Watseka line. Storms will be capable of locally heavy
downpours and gusty winds.

Increasing winds and waves on Lake Michigan will result in
dangerous swimming conditions at area beaches through Monday.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Monday...
  High Swim Risk at Southern Lake Michigan Beaches.
  Elevated Flooding Risk.
  Elevated Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.
Tuesday...
  Limited Flooding Risk.
  Limited Thunderstorm Risk.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

GENERAL STORM MOTION OF THE DAY:

 Moving toward the south-southeast at 30 mph.

$$

LMZ740>745-181645-
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-
1143 AM CDT Sun Aug 17 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...This Afternoon and Tonight.

Weather hazards expected...

  Hazardous conditions for small craft.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Monday...
  Hazardous conditions for small craft are likely.
  Elevated Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.
Tuesday...
  Limited Thunderstorm Risk.
Wednesday...
  Hazardous conditions for small craft are likely.

$$

Yack

Visit us at www.weather.gov/chicago