National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Prolonged Extreme Cold; Eastern U.S. Winter Storm

Another Arctic blast will surge south across the northern Plains Thursday night, crossing the Midwest and reaching the Gulf Coast Friday night. Confidence continues to increase for significant heavy snow across much of the Southern Appalachians, Carolinas, and southern Mid-Atlantic Friday into Sunday. Read More >

Hazardous Weather Conditions

Current conditions at

Illinois Valley Regional Airport (KVYS)

Lat: 41.35°NLon: 89.15°WElev: 650ft.

Fair

N/A

Humidity NA
Wind Speed N 5 mph
Barometer 30.32 in
Dewpoint N/A
Visibility 10.00 mi
Last update 29 Jan 6:30 am CST
Extended Forecast for

Mark IL

  • Today

    Today: Partly sunny, with a high near 16. Wind chill values as low as -5. North wind around 5 mph.

    High: 16 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 0. Wind chill values as low as -10. North wind around 5 mph.

    Low: 0 °F

    Decreasing
    Clouds

  • Friday

    Friday: Mostly sunny, with a high near 16. Wind chill values as low as -10. North wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 16 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 5. Wind chill values as low as -10. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 5 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 22.

    High: 22 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 6.

    Low: 6 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 26.

    High: 26 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 40 percent chance of snow. Mostly cloudy, with a low around 18.

    Low: 18 °F

    Chance Snow

  • Monday

    Monday: Partly sunny, with a high near 32.

    High: 32 °F

    Partly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 16. Wind chill values as low as -5. North wind around 5 mph.
Tonight
Mostly cloudy, then gradually becoming clear, with a low around 0. Wind chill values as low as -10. North wind around 5 mph.
Friday
Mostly sunny, with a high near 16. Wind chill values as low as -10. North wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Partly cloudy, with a low around 5. Wind chill values as low as -10. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 22.
Saturday Night
Mostly clear, with a low around 6.
Sunday
Mostly sunny, with a high near 26.
Sunday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 18.
Monday
Partly sunny, with a high near 32.
Monday Night
Mostly cloudy, with a low around 18.
Tuesday
Partly sunny, with a high near 31.
Tuesday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 19.
Wednesday
A 40 percent chance of snow. Mostly cloudy, with a high near 30.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mark IL
 41.26°N 89.26°W (Elev. 699 ft)
Last Update:
5:26 am CST Jan 29, 2026
Forecast Valid:
6am CST Jan 29, 2026-6pm CST Feb 4, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation