Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1003 PM CDT Thu Jun 11 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-130315-
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-
1003 PM CDT Thu Jun 11 2026 /1103 PM EDT Thu Jun 11 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 in northwest Indiana.

DISCUSSION...

Scattered thunderstorms will come to an end across northwest
Indiana through midnight tonight. No additional severe weather is
expected.

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

Saturday...
  Limited Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.
Tuesday and Wednesday...
  Limited Thunderstorm Risk.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east-northeast at 45 mph.

$$

Flood Warning
National Weather Service Chicago IL
947 PM CDT Thu Jun 11 2026

...The National Weather Service in Chicago IL has issued a Flood
Warning 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.

Additional information is available at www.weather.gov.

The next statement will be issued by Friday afternoon.

&&

ILC031-122100-
/O.NEW.KLOT.FL.W.0038.260612T0600Z-260613T0600Z/
/THNI2.1.ER.260612T0600Z.260612T1200Z.000000T0000Z.NO/
947 PM CDT Thu Jun 11 2026

...FLOOD WARNING IN EFFECT FROM LATE TONIGHT TO EARLY SATURDAY
MORNING...

* WHAT...Minor flooding is forecast.

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

* WHEN...From late tonight to early Saturday morning.

* IMPACTS...At 8.0 feet, Athletic fields are inundated at Glenwood
  Academy.
  At 9.0 feet, Water begins to be diverted through Thorn Creek
  Diversion Tunnel.

* ADDITIONAL DETAILS...
  - At 9:30 PM CDT Thursday the stage was 8.3 feet.
  - Forecast...The river is expected to rise above flood stage
    around midnight tonight and crest near 9.5 feet tomorrow
    morning.
  - Flood stage is 9.0 feet.
  - http://www.weather.gov/safety/flood

&&

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


$$

WSL

Flood Warning
National Weather Service Chicago IL
944 PM CDT Thu Jun 11 2026

...The National Weather Service in Chicago IL has issued a Flood
Warning for the following rivers in Illinois...Indiana...

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

Additional information is available at www.weather.gov.

The next statement will be issued by Friday afternoon.

&&

ILC031-INC089-122045-
/O.NEW.KLOT.FL.W.0037.260612T0400Z-260613T0000Z/
/LCMI3.1.ER.260612T0400Z.260612T0900Z.260613T0000Z.NO/
944 PM CDT Thu Jun 11 2026

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

* WHAT...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 9:00 PM CDT Thursday the stage was 10.7 feet.
  - Forecast...The river is expected to quickly rise above flood
    stage late this evening to a crest near 13.0 feet late
    tonight.
  - Flood stage is 12.0 feet.
  - http://www.weather.gov/safety/flood

&&

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


$$

WSL

Hazard Report Provided By forecast.weather.gov