Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
128 PM CDT Mon Jul 20 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-211830-
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-
128 PM CDT Mon Jul 20 2026 /228 PM EDT Mon Jul 20 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...

  Limited Thunderstorm Risk...with an associated:
     Level 1 of 5 Tornado Risk.
     Level 2 of 5 Damaging Wind Risk...up to 70 mph.
     Level 1 of 5 Large Hail Risk...up to 1 inch in diameter.
  Limited Flooding Risk.

DISCUSSION...

Scattered thunderstorm are likely this evening into the early overnight
hours. While not every area will see storms, where storms do occur
some could be severe with damaging winds the primary threat. Isolated
large hail is also possible. In addition, storms this evening
will produce torrential rainfall.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Tuesday afternoon through early Thursday...
 High Swim Risk Lake Michigan Beaches.

Hazardous swim conditions are expected to develop Tuesday night
and continue through Wednesday night.

.SPOTTER INFORMATION STATEMENT...

  Spotters may be needed this evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the southeast at 40 mph.

$$

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-210500-
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-
Including the cities of Rockford, Belvidere, Crystal Lake,
Algonquin, McHenry, Woodstock, Waukegan, Buffalo Grove, Mundelein,
Gurnee, Rochelle, Oregon, Byron, Dixon, DeKalb, Sycamore, Aurora,
Elgin, Naperville, Wheaton, Downers Grove, Lombard, Carol Stream,
Ottawa, Streator, La Salle, Mendota, Marseilles, Oswego, Yorkville,
Plano, Morris, Coal City, Minooka, Kankakee, Bourbonnais, Bradley,
Pontiac, Dwight, Fairbury, Watseka, Gilman, Paxton, Gibson City,
Evanston, Des Plaines, Schaumburg, Palatine, Northbrook, Chicago,
Cicero, Oak Lawn, Oak Park, La Grange, Calumet City, Oak Forest,
Lemont, Orland Park, Park Forest, Joliet, Bolingbrook, Plainfield,
Mokena, Channahon, Manhattan, Wilmington, Crete, Peotone,
and Beecher
1250 PM CDT Sun Jul 19 2026

...AIR QUALITY ALERT IN EFFECT NOW THROUGH MONDAY NIGHT...

The Illinois Environmental Protection Agency has issued an Areawide
Air Pollution Action Day for Monday July 20th for portions of
Illinois. This is in addition to the ongoing Areawide Air Pollution
Action Day in effect today July 19th for the same areas.

An Areawide Air Pollution Action Day is declared when weather
conditions are such that widespread ozone and or particulate levels
are forecast to be at or above the Unhealthy for Sensitive Groups
(USG) category in all or nearly all Illinois AQI forecast sectors.

Areas both inside and outside of the Action Day coverage area are
likely to see smoke/particulates to a varying degree and duration
today and Monday with smoke likely decreasing from southwest to
northeast through the day Monday. Those with air quality concerns or
anyone in Illinois with outdoor plans is encouraged to check current
NowCast readings or sign up for EnviroFlash alerts on AirNow. gov.
Before going outside, checking the NowCast AQI will help identify
periods of both poor and cleaner air quality regardless of the level
of the daily 24-hour AQI forecast.

AQI Category Guidance Unhealthy for Sensitive Groups (USG) - Members
of sensitive groups may experience health effects. The general
public is less likely to be affected. Sensitive groups: Make outdoor
activities shorter and less intense. Its OK to be active outdoors,
but take more breaks. Watch for symptoms such as coughing or
shortness of breath. People with asthma: Follow your asthma action
plan and keep quick relief medicine handy. People with heart disease:
Symptoms such as palpitations, shortness of breath, or unusual
fatigue may indicate a serious problem. If you have any of these,
contact your health care provider. Unhealthy - Sensitive groups:
Avoid long or intense outdoor activities. Consider rescheduling or
moving activities indoors. Everyone else: Reduce long or intense
activities. Take more breaks during outdoor activities.


Media Contact... Illinois EPA

$$

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