Hazard Report Provided By forecast.weather.gov

Hydrologic Outlook
ILC007-031-037-043-053-063-075-089-091-093-097-099-103-105-111-
141-197-201-INC007-073-089-111-127-162000-

Hydrologic Outlook
National Weather Service Chicago IL
244 AM CDT Tue Jun 16 2026 /344 AM EDT Tue Jun 16 2026/

...HEAVY RAINFALL MAY LEAD TO FLOODING WEDNESDAY...

Period of showers and thunderstorms are expected Wednesday.
Thunderstorms will be very efficient at producing torrential
rainfall, with some areas likely receiving up 2 inches of rain in
just an hour. Rainfall that intense would likely result in flash
flooding.

In addition, localized rainfall totals in excess of 3 inches are
possible across northern and central Illinois and northwest
Indiana through the day Wednesday, which could result in
significant rises and possible flooding on area streams and
rivers.

Recent heavy rainfall has left streamflow above average in many
areas and grounds still saturated. This will further increase the
threat of flooding.

Anyone in or near flood prone areas should closely monitor later
forecasts.

$$

- Izzi

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
317 AM CDT Tue Jun 16 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-170830-
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-
317 AM CDT Tue Jun 16 2026 /417 AM EDT Tue Jun 16 2026/

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...with an associated:
     Level 1 of 5 Damaging Wind Risk...up to 60 mph.
     Level 1 of 5 Large Hail Risk...up to half dollar size.

DISCUSSION...

Isolated, non-severe, thunderstorms are expected this morning.

Then scattered thunderstorms are likely to redevelop along a cold
front over far eastern Illinois into northwest Indiana during the
early to mid afternoon, especially near and east of Interstate
55. A couple of these storms could become severe capable of
producing large hail and damaging winds.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday...
  Elevated Flooding Risk.
  Significant Thunderstorm Risk...with an associated:
     Level 4 of 5 Severe Thunderstorm Risk.
  High Swim Risk Illinois Lake Michigan Beaches.
Thursday...
  High Swim Risk Indiana Lake Michigan Beaches.
Saturday and Sunday...
  Limited Thunderstorm Risk.

DISCUSSION...

Two rounds of potentially severe thunderstorms are expected
Wednesday.

The first during the morning into the early afternoon. Some of
those thunderstorms could be severe capable of damaging winds up
to 75 mph and large hail up to golf ball sized. The greatest
severe risk with this activity is expected to be near and south of
I-80.

A second round of potentially dangerous severe thunderstorms is
expected late in the afternoon into the early evening Wednesday.
These storms could produce tornadoes anywhere across northern
Illinois and northwest Indiana, but the tornado threat looks
particularly worrisome south of I-80 and across northwest
Indiana. It is in those areas that the threat of long tracked and
particularly damaging tornadoes appears highest. In addition to
the tornado threat, thunderstorms late Wednesday afternoon and
evening will be capable of producing widespread damaging winds,
potentially in excess of 80 mph in areas that get hit the hardest.

Finally, thunderstorms Wednesday will capable of producing
torrential rainfall that could result in areas of flash flooding
Wednesday morning through early Wednesday evening.

.SPOTTER INFORMATION STATEMENT...

  Spotters may be needed east of I-55 this afternoon, and will
  likely be needed Wednesday.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east at 25 mph.

$$

Hazard Report Provided By forecast.weather.gov