Heavy Rainfall and Severe Thunderstorm Threats; Heat Risk Expands; Monitoring the Tropics

Flash flooding risks continue for portions of the Four Corners and Great Basin through today. Severe thunderstorms are outlooked from the eastern Great Lakes, southern New England into the mid-Atlantic through Tuesday. Heat risk increases and expands across the center of the nation and across the Ohio Valley and mid-Atlantic this week. Continue to closely monitor tropical development in the Gulf. Read More >

Hazardous Weather Conditions

Current conditions at

Sterling Rockfalls (KSQI)

Lat: 41.74°NLon: 89.67°WElev: 643ft.

A Few Clouds

89°F

32°C

Humidity 53%
Wind Speed SW 15 G 18 mph
Barometer 29.94 in (1013.2 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index94°F (34°C)
Last update 31 Aug 11:56 am CDT
Extended Forecast for

3 Miles ENE Nelson IL

  • This Afternoon

    This Afternoon: A 20 percent chance of showers and thunderstorms after 2pm.  Mostly sunny, with a high near 87. Heat index values as high as 95. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 87 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 10pm.  Partly cloudy, with a low around 72. South southwest wind around 5 mph, with gusts as high as 10 mph.

    Low: 72 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms before 10am.  Mostly sunny, with a high near 90. Heat index values as high as 99. Southwest wind 5 to 10 mph.

    High: 90 °F

    Slight Chance
    T-storms then
    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 72. South southwest wind around 5 mph, with gusts as high as 10 mph.

    Low: 72 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 91. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 91 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 71.

    Low: 71 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms before 1pm.  Mostly sunny, with a high near 87.

    High: 87 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 87. Heat index values as high as 95. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 72. South southwest wind around 5 mph, with gusts as high as 10 mph.
Tuesday
A 20 percent chance of showers and thunderstorms before 10am. Mostly sunny, with a high near 90. Heat index values as high as 99. Southwest wind 5 to 10 mph.
Tuesday Night
Mostly clear, with a low around 72. South southwest wind around 5 mph, with gusts as high as 10 mph.
Wednesday
Sunny, with a high near 91. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71.
Thursday
A 30 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 87.
Thursday Night
Partly cloudy, with a low around 69.
Friday
Mostly sunny, with a high near 88.
Friday Night
Mostly clear, with a low around 68.
Saturday
Mostly sunny, with a high near 87.
Saturday Night
Mostly clear, with a low around 66.
Sunday
Mostly sunny, with a high near 85.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ENE Nelson IL
 41.81°N 89.56°W
11:51 am CDT Aug 31, 2026
12pm CDT Aug 31, 2026-6pm CDT Sep 6, 2026
 
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Additional Resources

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Hourly Weather Forecast

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