Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
256 PM CDT Thu Aug 13 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-142100-
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-
256 PM CDT Thu Aug 13 2026 /356 PM EDT Thu Aug 13 2026/

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

.DAY ONE...Tonight.

Weather hazards expected...

  Elevated Thunderstorm Risk...with an associated:
     Level 2 of 5 Damaging Wind Risk...up to 60 mph.
     Level 2 of 5 Large Hail Risk...up to quarter size.
  Elevated Flooding Risk.

DISCUSSION...

Showers are likely tonight with a chance for thunderstorms.
Some of these storms could be severe with primarily a damaging wind
threat mainly south of a Mendota to Rensselaer line.

In addition, locally heavy rainfall due to training storms
may lead to flooding . At this time, the heaviest rainfall is
expected to occur generally south of a Forreston Illinois to
Valparaiso Indiana line.

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

Friday...
  Significant Flooding Risk.
  Limited Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.
Saturday...
  Elevated Flooding Risk.
  Limited Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.
Sunday...
  Limited Thunderstorm Risk.
Tuesday night and Wednesday...
  Limited Thunderstorm Risk.

DISCUSSION...

An active weather pattern is expected to persist into this
weekend, with periodic shower and thunderstorm chances. These
showers and storms will be capable of producing torrential
rainfall at times, which could lead to flash flooding.

.SPOTTER INFORMATION STATEMENT...

  Spotters may not be needed, but any reports are appreciated.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the southeast at 25 to 35 mph.

$$

Hazard Report Provided By forecast.weather.gov