Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
350 AM CDT Thu Jun 18 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-190900-
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-
350 AM CDT Thu Jun 18 2026 /450 AM EDT Thu Jun 18 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...

  High Swim Risk Porter County Indiana Lake Michigan Beaches.

DISCUSSION...

High waves and strong currents are expected early this morning at
Porter County Indiana Lake Michigan Beaches.

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

Friday night...
  Limited Thunderstorm Risk.
Saturday night and Sunday...
  Elevated Flooding Risk.
  Limited Thunderstorm Risk.
  High Swim Risk Lake Michigan Beaches.
Monday...
  High Swim Risk Lake Michigan Beaches.
Tuesday and Wednesday...
  Limited Thunderstorm Risk.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

$$

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

Hazard Report Provided By forecast.weather.gov