307
FLUS43 KLOT 200930
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
430 AM CDT Sun Jul 20 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-210930-
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-
430 AM CDT Sun Jul 20 2025 /530 AM EDT Sun Jul 20 2025/

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

.DAY ONE...Today and Tonight.

Weather hazards expected...

  Limited Thunderstorm Risk areawide...with an associated:
     Level 1 of 5 Damaging Wind Risk...up to 60 mph toward
      central Illinois.
  Elevated Flooding Risk south of I-80 tonight.
  High Swim Risk Lake Michigan Beaches in Illinois.

DISCUSSION...

Showers and thunderstorms are expected to cross the area this
morning, with additional thunderstorms capable of producing
damaging winds toward central Illinois late this afternoon and
early evening.

Another round of thunderstorms with an axis of torrential
rainfall and potential flooding across central Illinois could
reach as far north of a Pontiac to Fowler line tonight.

Dangerous swimming conditions continue for the Illinois beaches
of Lake Michigan through tonight.

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

Monday...
  Limited Thunderstorm Risk.
Wednesday and Thursday...
  Elevated Excessive Heat Risk.
Thursday night...
  Limited Thunderstorm Risk.
Friday...
  Limited Thunderstorm Risk.
  Limited Excessive Heat Risk.
Saturday...
  Limited Thunderstorm Risk.

DISCUSSION...

Dangerous heat and humidity is expected Wednesday and Thursday.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed late this afternoon toward central
Illinois.

GENERAL STORM MOTION OF THE DAY:

 Moving toward the east at 40 mph.

$$

LMZ740>745-210930-
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-
430 AM CDT Sun Jul 20 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...Today and Tonight.

Weather hazards expected...

  Limited Thunderstorm Risk.

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

Thursday through Saturday...
  Limited Thunderstorm Risk.

$$

Kluber

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