Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook...UPDATED
National Weather Service Chicago/Romeoville IL
952 PM CDT Wed Jun 17 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-190300-
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-
952 PM CDT Wed Jun 17 2026 /1052 PM EDT Wed Jun 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...with an associated:
     Level 1 of 5 Tornado Risk.
     Level 1 of 5 Damaging Wind Risk...up to 60 mph.
  High Swim Risk Lake Michigan Beaches.

DISCUSSION...

A few isolated to widely scattered thunderstorms will affect parts
of far northeast Illinois through the late evening hours. Widespread
severe weather is not expected, though the strongest cells may have
a brief isolated tornado or damaging wind threat. Storms should end
by midnight.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday...
  High Swim Risk Porter County Lake Michigan Beaches.
Saturday...
  Limited Thunderstorm Risk.
Sunday...
  Limited Flooding Risk.
  Limited Thunderstorm Risk.
Monday and Tuesday...
  Limited Thunderstorm Risk.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east-southeast at 35 mph.

$$

Flood Statement
National Weather Service Chicago IL
806 PM CDT Wed Jun 17 2026

...The Flood Warning continues for the following rivers in
Illinois...

  Thorn Creek at Thornton affecting Cook County.

For the Thorn Creek...including Thornton...Minor flooding is
forecast.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Warning means water levels above flood stage are imminent or
may already be occurring. Persons along rivers and streams in the
warned area should take immediate precautions to protect life and
property.

These forecasts are based on observed precipitation as well as
forecast precipitation 24 hours into the future. Changes to the
rainfall forecast, or any additional rainfall after 24 hours, may
cause changes to these river forecasts.

Additional information is available at www.weather.gov.

The next statement will be issued by Thursday afternoon.

&&

ILC031-181915-
/O.EXT.KLOT.FL.W.0045.000000T0000Z-260619T0336Z/
/THNI2.1.ER.260618T0139Z.260618T0600Z.260618T2136Z.NO/
806 PM CDT Wed Jun 17 2026

...FLOOD WARNING NOW IN EFFECT UNTIL LATE TOMORROW EVENING...

* WHAT...Minor flooding is forecast.

* WHERE...Thorn Creek from Near Glenwood downstream to confluence
  with Little Calumet River, including the Thornton gauge.

* WHEN...Until late tomorrow evening.

* IMPACTS...At 11.5 feet, Glenwood Thornton Road threatened north of
  Glenwood.

* ADDITIONAL DETAILS...
  - At 7:45 PM CDT Wednesday the stage was 8.4 feet.
  - Forecast...The river is expected to crest near 12 feet just
    after midnight tonight, then begin a slow fall.
  - Flood stage is 9.0 feet.
  - http://www.weather.gov/safety/flood

&&

LAT...LON 4161 8760 4158 8754 4151 8760 4154 8767


$$

Ratzer

Flood Statement
National Weather Service Chicago IL
803 PM CDT Wed Jun 17 2026

...The Flood Warning is extended for the following rivers in
Illinois...Indiana...

  Little Calumet River at Munster (Hohman Avenue) affecting Cook
  and Lake IN Counties.

For the Little Calumet River...including Munster (Hohman Avenue)...
Minor flooding is forecast.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Warning means water levels above flood stage are imminent or
may already be occurring. Persons along rivers and streams in the
warned area should take immediate precautions to protect life and
property.

These forecasts are based on observed precipitation as well as
forecast precipitation 24 hours into the future. Changes to the
rainfall forecast, or any additional rainfall after 24 hours, may
cause changes to these river forecasts.

Additional information is available at www.weather.gov.

The next statement will be issued by Thursday afternoon.

&&

ILC031-INC089-181915-
/O.EXT.KLOT.FL.W.0044.000000T0000Z-260619T0000Z/
/LCMI3.1.ER.260617T2221Z.260618T0600Z.260618T1800Z.NO/
803 PM CDT Wed Jun 17 2026

...FLOOD WARNING NOW IN EFFECT UNTIL TOMORROW EVENING...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Little Calumet River from IN-912 in Hammond downstream to
  confluence with Thorn Creek in South Holland, including the
  Munster (Hohman Avenue) gauge.

* WHEN...Until tomorrow evening.

* IMPACTS...At 12.5 feet, Most areas outside of the levee-protected
  area are inundated in Hammond and Munster.

* ADDITIONAL DETAILS...
  - At 7:00 PM CDT Wednesday the stage was 12.4 feet.
  - Forecast...The river is expected to crest of near 14 feet
    after midnight tonight.
  - Flood stage is 12.0 feet.
  - http://www.weather.gov/safety/flood

&&

LAT...LON 4163 8756 4159 8740 4153 8743 4157 8758


$$

Ratzer

Hazard Report Provided By forecast.weather.gov