Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
327 PM CDT Fri Jul 31 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-012030-
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-
327 PM CDT Fri Jul 31 2026 /427 PM EDT Fri Jul 31 2026/

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

.DAY ONE...Tonight.

Weather hazards expected...

  Elevated Flooding Risk.
  Limited Thunderstorm Risk.
  High Swim Risk Lake Michigan Beaches.

DISCUSSION...

Widely scattered showers and isolated thunderstorms will spread
across northern Illinois and northwest Indiana this evening and
continue at times overnight. Locally heavy rain is possible with
any showers and storms which may lead to localized flooding.

High waves and rip currents will lead to dangerous swimming
conditions at Illinois Lake Michigan beaches late tonight.


.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday...
  Elevated Flooding Risk.
  Limited Thunderstorm Risk.
  High Swim Risk Lake Michigan Beaches.
Sunday through Monday Morning...
  High Swim Risk Lake Michigan Beaches.
Wednesday and Thursday...
  Limited Thunderstorm Risk.

DISCUSSION...

Showers with embedded non-severe thunderstorms are expected to
persist through the day on Saturday. Continued heavy rain may lead
to flooding, especially in areas that receive repeated downpours.

Dangerous swimming conditions are expected at southern Lake
Michigan beaches through Monday morning.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east 30 to 40 mph.

$$

Hydrologic Outlook
ILC007-031-037-043-063-075-089-091-093-097-103-111-141-197-201-
INC007-073-089-111-127-010900-

Hydrologic Outlook
National Weather Service Chicago IL
219 PM CDT Fri Jul 31 2026

...MULTIPLE ROUNDS OF RAINFALL MAY LEAD TO LOCALIZED FLOODING THROUGH
SATURDAY...

A slow moving weather system will bring widespread showers, some
heavy, to the area through Saturday. Rainfall may cause ponding in
poor drainage areas, rises on area streams, and localized flooding.
The most likely areas for flooding include urban areas and areas that
received rainfall earlier this week.

Conditions will be favorable for rainfall rates in excess of 1 inch
per hour in isolated areas. The exact locations expected to receive
the heaviest rainfall remains uncertain at this time.

This outlook means that elevated water levels and potential impacts
are possible, but not yet certain. Persons should closely monitor
forecasts including the possibility of flood watches, warnings, and
advisories.

$$

Petr

Hazard Report Provided By forecast.weather.gov