Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
929 PM CDT Thu Sep 17 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-190230-
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-
929 PM CDT Thu Sep 17 2026 /1029 PM EDT Thu Sep 17 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 south of I-80.

DISCUSSION...

A few isolated thunderstorms couldn`t be ruled out south of I-80
overnight. Most of the area will remain dry tonight.

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

Friday...
  High Swim Risk Illinois Beaches.
Friday night...
  Elevated Flooding Risk.
  Limited Thunderstorm Risk.
  High Swim Risk Illinois Beaches.
Saturday...
  Elevated Flooding Risk.
  Limited Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.
  High Swim Risk Illinois Beaches.
Sunday and Monday...
  Limited to Elevated Flooding Risk.
  Limited Thunderstorm Risk.
  High Swim Risk Lake Michigan Beaches.

DISCUSSION...

Additional episodes of showers and storms are expected in the
general area this weekend. Repeated rounds of torrential rainfall
may lead to instances of flash flooding, as well as river rises
into next week.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east-southeast at 25 to 30 mph.

$$

Hazard Report Provided By forecast.weather.gov