National Weather Service

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

Current conditions at

Illinois Valley Regional Airport (KVYS)

Lat: 41.35°NLon: 89.15°WElev: 650ft.

Partly Cloudy

79°F

26°C

Humidity	45%
Wind Speed	Calm
Barometer	30.07 in
Dewpoint	55°F (13°C)
Visibility	10.00 mi
Heat Index	80°F (27°C)
Last update	24 Aug 4:38 pm CDT

More Information:

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

Extended Forecast for

Grand Ridge IL

Tonight
Low: 57 °F
Mostly Clear
Tuesday
High: 81 °F
Mostly Sunny
Tuesday Night
Low: 65 °F
Partly Cloudy
Wednesday
High: 85 °F
Slight Chance
T-storms then
Chance
T-storms
Wednesday Night
Low: 63 °F
Slight Chance
T-storms then
Mostly Clear
Thursday
High: 82 °F
Sunny
Thursday Night
Low: 61 °F
Clear
Friday
High: 82 °F
Sunny
Friday Night
Low: 62 °F
Mostly Clear

Detailed Forecast

Tonight

Mostly clear, with a low around 57. Calm wind.

Tuesday

Mostly sunny, with a high near 81. Calm wind becoming south around 5 mph in the afternoon.

Tuesday Night

Partly cloudy, with a low around 65. Calm wind becoming south around 5 mph after midnight. Winds could gust as high as 10 mph.

Wednesday

A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 85. West wind 5 to 15 mph, with gusts as high as 25 mph.

Wednesday Night

A 20 percent chance of showers and thunderstorms before 10pm. Mostly clear, with a low around 63. West northwest wind around 5 mph, with gusts as high as 15 mph.

Thursday

Sunny, with a high near 82.

Thursday Night

Clear, with a low around 61.

Friday

Sunny, with a high near 82.

Friday Night

Mostly clear, with a low around 62.

Saturday

Mostly sunny, with a high near 83.

Saturday Night

Partly cloudy, with a low around 67.