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August 11, 2026: Powerful Morning Derecho Produces Widespread Wind Damage and Tornadoes Across Northern Illinois and Northwest Indiana

Hazardous Weather Conditions

Current conditions at

Lewis University Airport (KLOT)

Lat: 41.6°NLon: 88.1°WElev: 669ft.

Fair

79°F

26°C

Humidity	79%
Wind Speed	S 7 mph
Barometer	30.02 in
Dewpoint	72°F (22°C)
Visibility	10.00 mi
Heat Index	82°F (28°C)
Last update	21 Aug 2:45 pm CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

2 Miles ESE Homer Glen IL

Severe T-storm Watch until August 21, 10:00pm

Click here for hazard details and duration

Severe T-storm Watch

Severe T-storm Watch until August 21, 10:00pm
NOW until 10:00pm Fri
Severe T-storm Watch
This Afternoon
High: 80 °F
Chance
T-storms
Tonight
Low: 63 °F
T-storms
Likely then
Chance
T-storms
Saturday
High: 79 °F
Mostly Sunny
then Slight
Chance
T-storms
Saturday Night
Low: 60 °F
Mostly Clear
Sunday
High: 76 °F
Sunny
Sunday Night
Low: 56 °F
Partly Cloudy
Monday
High: 76 °F
Mostly Sunny
Monday Night
Low: 59 °F
Partly Cloudy

Detailed Forecast

This Afternoon

A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 80. South southwest wind around 10 mph.

Tonight

Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 63. South southwest wind around 5 mph becoming west after midnight. Winds could gust as high as 10 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday

A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 79. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.

Saturday Night

Mostly clear, with a low around 60. North northwest wind 5 to 10 mph, with gusts as high as 15 mph.

Sunday

Sunny, with a high near 76. North northwest wind 5 to 10 mph, with gusts as high as 15 mph.

Sunday Night

Partly cloudy, with a low around 56.

Monday

Mostly sunny, with a high near 76.

Monday Night

Partly cloudy, with a low around 59.