Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
342 PM CDT Wed Aug 12 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-132045-
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-
342 PM CDT Wed Aug 12 2026 /442 PM EDT Wed Aug 12 2026/

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

.DAY ONE...Tonight.

Weather hazards expected...

  Limited Fog Risk.

DISCUSSION...

Fog may become locally dense tonight.

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

Thursday and Friday...
  Elevated Flooding Risk.
  Limited Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.
Saturday...
  Elevated Flooding Risk.
  Limited Thunderstorm Risk.
Sunday...
  Limited Thunderstorm Risk.


DISCUSSION...

An active weather pattern with periodic thunderstorm chances is
expected to persist into the weekend. Some of these storms may be
strong to severe at times, as well as capable of producing heavy
rainfall which could lead to flash flooding.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

$$

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
242 AM CDT Thu Aug 13 2026

ILZ003-004-008-010>013-019>021-023-032-033-039-105>108-INZ001-002-
010-011-019-131400-
/O.NEW.KLOT.FG.Y.0013.260813T0742Z-260813T1400Z/
Winnebago-Boone-Ogle-Lee-De Kalb-Kane-DuPage-La Salle-Kendall-
Grundy-Kankakee-Livingston-Iroquois-Ford-Southern Cook-Northern
Will-Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-
Benton-
Including the cities of Rochelle, Mokena, Portage, Channahon,
Watseka, Hammond, Orland Park, Crete, Pontiac, Dwight, Byron,
Morocco, Oswego, Oxford, Fairbury, Gary, Aurora, Lemont, Valparaiso,
Downers Grove, Streator, Beecher, Chesterton, Yorkville, Fowler,
Peotone, La Salle, Bradley, Minooka, Elgin, Manhattan, Wheaton,
Lombard, Marseilles, Sycamore, Bourbonnais, Rockford, Dixon, Mendota,
Kankakee, Park Forest, Bolingbrook, Plainfield, Rensselaer,
Naperville, DeMotte, Ottawa, Calumet City, Carol Stream, Gilman,
Belvidere, Oak Forest, Joliet, Merrillville, Kentland, Oregon, Gibson
City, DeKalb, Morris, Plano, Wilmington, Roselawn, Coal City, and
Paxton
242 AM CDT Thu Aug 13 2026 /342 AM EDT Thu Aug 13 2026/

...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM CDT /10 AM EDT/ THIS
MORNING...

* WHAT...Visibility one quarter mile or less in dense fog.

* WHERE...Portions of central, east central, north central, and
  northeast Illinois and northwest Indiana.

* WHEN...Until 9 AM CDT /10 AM EDT/ this morning.

* IMPACTS...Low visibility could make driving conditions hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.

&&

$$

Ratzer

Flood Watch
National Weather Service Chicago IL
208 AM CDT Thu Aug 13 2026

ILZ008-010-011-019>021-023-032-033-039-106>108-INZ010-011-019-131515-
/O.NEW.KLOT.FA.A.0012.260814T0000Z-260814T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ogle-Lee-De Kalb-La Salle-Kendall-Grundy-Kankakee-Livingston-
Iroquois-Ford-Northern Will-Southern Will-Eastern Will-Newton-
Jasper-Benton-
Including the cities of Rochelle, Mokena, Channahon, Watseka, Crete,
Pontiac, Dwight, Byron, Morocco, Oswego, Oxford, Fairbury, Streator,
Beecher, Yorkville, Fowler, Peotone, La Salle, Bradley, Minooka,
Manhattan, Bourbonnais, Marseilles, Sycamore, Bolingbrook, Dixon,
Mendota, Kankakee, Plainfield, Rensselaer, DeMotte, Ottawa, Gilman,
Joliet, Kentland, Oregon, Gibson City, DeKalb, Morris, Plano,
Wilmington, Roselawn, Coal City, and Paxton
208 AM CDT Thu Aug 13 2026 /308 AM EDT Thu Aug 13 2026/

...FLOOD WATCH IN EFFECT FROM THIS EVENING THROUGH FRIDAY MORNING...

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

* WHERE...Portions of Illinois, including the following areas, De
  Kalb, Eastern Will, Ford, Grundy, Iroquois, Kankakee, Kendall, La
  Salle, Lee, Livingston, Northern Will, Ogle and Southern Will and
  northwest Indiana, including the following areas, Benton, Jasper
  and Newton.

* WHEN...From this evening through Friday morning.

* IMPACTS...Creeks and streams may rise out of their banks.

* ADDITIONAL DETAILS...
  - The potential exists for repeated rounds of showers and
    thunderstorms developing north of a stalled surface front.
    Localized rainfall rates may exceed 2 inches per hour over
    portions of northern Illinois and northwest Indiana tonight into
    early Friday morning. Portions of the watch area received as much
    as 2 to 4 inches of rainfall over the past few days and will be
    more susceptible to flooding with any additional heavy rainfall.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch for flash flooding means rapid-onset flooding is
possible, but not yet certain, based upon the latest forecasts. Flash
flooding is a dangerous situation. Persons with interests along area
rivers, creeks, and other waterways should monitor the latest
forecasts and be prepared to take action should flooding develop.

&&

$$

Ratzer

Hazard Report Provided By forecast.weather.gov