Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
151 PM CDT Fri Aug 14 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-151900-
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-
151 PM CDT Fri Aug 14 2026 /251 PM EDT Fri Aug 14 2026/

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

.DAY ONE...This Afternoon and Tonight.

Weather hazards expected...

  Significant Flooding Risk especially along and south of Interstate 80.
  Limited Thunderstorm Risk...with an associated:
     Level 2 of 5 Damaging Wind Risk...up to 60 mph.

DISCUSSION...

Another round of thunderstorms is expected tonight with the
highest coverage favored along and south of Interstate 80.
Torrential rain rates may lead to widespread flash flooding. In
addition, locally damaging winds cannot be ruled out.

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

Saturday...
  Significant Flooding Risk in the morning south of Interstate 80.
Sunday...
  Limited Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.
Tuesday and Wednesday...
  Limited Flooding Risk.
  Limited Thunderstorm Risk.

DISCUSSION...

A strong to severe storm cannot be ruled out Saturday night into
early Sunday morning. Then, additional storms may occur during the
middle of next week.

.SPOTTER INFORMATION STATEMENT...

  Spotters may be needed overnight for flash flooding reports.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east at 30 mph.

$$

Flood Statement
National Weather Service Chicago IL
801 PM CDT Fri Aug 14 2026

...The Flood Warning is extended 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 Saturday afternoon.

&&

ILC031-151915-
/O.EXT.KLOT.FL.W.0069.000000T0000Z-260817T1342Z/
/THNI2.1.ER.260814T1522Z.260816T0600Z.260817T0742Z.NO/
801 PM CDT Fri Aug 14 2026

...FLOOD WARNING NOW IN EFFECT UNTIL MONDAY MORNING...

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

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

* WHEN...Until Monday morning.

* IMPACTS...At 13.5 feet, Chicago Heights Glenwood Road threatened in
  Glenwood. Residential parking lots threatened along Margaret Street
  in Thornton.

* ADDITIONAL DETAILS...
  - At 7:45 PM CDT Friday the stage was 9.4 feet.
  - Forecast...The river may fall to near flood stage late this
    evening, although additional rainfall in the forecast may prolong
    flooding impacts, resulting in another rise on Saturday into
    Saturday evening.
  - Flood stage is 9.0 feet.
  - http://www.weather.gov/safety/flood

&&

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


$$

Carlaw

Flood Watch
National Weather Service Chicago IL
1201 PM CDT Fri Aug 14 2026

ILZ008-010>013-020-103>106-150300-
/O.NEW.KLOT.FA.A.0013.260815T0300Z-260815T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ogle-Lee-De Kalb-Kane-DuPage-Kendall-Northern Cook-Central Cook-
Southern Cook-Northern Will-
Including the cities of Plano, Park Forest, Bolingbrook, Dixon,
Palatine, Aurora, Northbrook, Evanston, Elgin, Chicago, Joliet, La
Grange, Oregon, Rochelle, Downers Grove, Oak Lawn, Oak Forest,
Oswego, Mokena, Sycamore, Schaumburg, Plainfield, Yorkville, Oak
Park, Carol Stream, DeKalb, Des Plaines, Orland Park, Cicero,
Lombard, Calumet City, Lemont, Byron, Wheaton, and Naperville
1201 PM CDT Fri Aug 14 2026

...FLOOD WATCH IN EFFECT FROM 10 PM CDT THIS EVENING THROUGH SATURDAY
MORNING...

* WHAT...Flash flooding caused by excessive rainfall is possible.

* WHERE...Portions of north central and northeast Illinois including
  Lee, Ogle, DeKalb, Kane, Kendall, DuPage, Cook, and northern Will
  counties.

* WHEN...From 10 PM CDT this evening through Saturday morning.

* IMPACTS...Creeks and streams may rise out of their banks. Flooding
  may occur in poor drainage and urban areas, especially in the
  vicinity of storm drains that are clogged by leaf debris.
  Underpasses and viaducts may flood in urban areas, as well.

* ADDITIONAL DETAILS...
  - Another round of torrential rain-producing showers and storms is
    expected across the watch area tonight. Saturated soils and
    torrential downpours will set the stage for flash flooding.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts. Have multiple ways to receive warning
information including at least one way that will wake you up.

&&

$$

Hazard Report Provided By forecast.weather.gov