Lake-effect Snow and Whiteout Conditions in the Great Lakes Region; Below-average Temperatures in the East

Heavy lake-effect and lake-enhanced snow will persist downwind of the Great Lakes and produce some whiteout conditions that could cause difficult travel conditions. A coastal low will produce moderate to heavy snow over parts of southern and eastern New England into the afternoon. Below average temperatures are expected across the eastern U.S., particularly with chilly morning temperatures. Read More >

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Light Snow

16°F

-9°C

Humidity 79%
Wind Speed SW 10 mph
Barometer 29.82 in
Dewpoint 10°F (-12°C)
Visibility 6.00 mi
Wind Chill4°F (-16°C)
Last update 18 Jan 8:45 pm CST
Extended Forecast for

5 Miles WSW Fort Atkinson WI

Winter Weather Advisory January 18, 09:06pm until January 19, 12:00pm
Cold Weather Advisory January 19, 03:00am until January 19, 12:00pm
Click here for hazard details and duration
Winter Weather Advisory
Cold Weather Advisory
  •  
    Winter Weather Advisory January 18, 09:06pm until January 19, 12:00pm

    NOW until 12:00pm Mon

    Winter Weather Advisory

  • Tonight

    Low: -3 °F

    Snow then
    Chance Snow
    and Areas
    Blowing Snow

  • M.L.King Day

    M.L.King Day: Areas of blowing snow before noon. Partly sunny and cold, with a high near 4. Wind chill values between -15 and -25. Blustery, with a northwest wind 10 to 20 mph, with gusts as high as 35 mph.

    High: 4 °F

    Areas Blowing
    Snow and
    Blustery then
    Mostly Sunny
    and Breezy

  • Monday Night

    Monday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around -4. Wind chill values between -10 and -15. West wind 5 to 10 mph.

    Low: -4 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Mostly sunny, with a high near 14. Wind chill values between -5 and -15. West wind 5 to 10 mph.

    High: 14 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Snow likely, mainly after midnight.  Mostly cloudy, with a low around 10. South wind around 5 mph.  Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.

    Low: 10 °F

    Chance Snow
    then Snow
    Likely

  • Wednesday

    Wednesday: A 20 percent chance of snow.  Mostly cloudy, with a high near 23. West wind 5 to 15 mph.

    High: 23 °F

    Slight Chance
    Snow

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow before midnight.  Mostly cloudy, with a low around 4. West wind 10 to 15 mph.

    Low: 4 °F

    Slight Chance
    Snow then
    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 13. West wind around 10 mph.

    High: 13 °F

    Mostly Sunny

Detailed Forecast

Tonight
Snow, mainly before 1am. Areas of blowing snow after midnight. Low around -3. Wind chill values between -10 and -20. Blustery, with a northwest wind 5 to 10 mph increasing to 15 to 20 mph after midnight. Winds could gust as high as 35 mph. Chance of precipitation is 80%. Total nighttime snow accumulation of less than one inch possible.
M.L.King Day
Areas of blowing snow before noon. Partly sunny and cold, with a high near 4. Wind chill values between -15 and -25. Blustery, with a northwest wind 10 to 20 mph, with gusts as high as 35 mph.
Monday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around -4. Wind chill values between -10 and -15. West wind 5 to 10 mph.
Tuesday
Mostly sunny, with a high near 14. Wind chill values between -5 and -15. West wind 5 to 10 mph.
Tuesday Night
Snow likely, mainly after midnight. Mostly cloudy, with a low around 10. South wind around 5 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.
Wednesday
A 20 percent chance of snow. Mostly cloudy, with a high near 23. West wind 5 to 15 mph.
Wednesday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 4. West wind 10 to 15 mph.
Thursday
Mostly sunny, with a high near 13. West wind around 10 mph.
Thursday Night
A 20 percent chance of snow. Mostly cloudy, with a low around -2.
Friday
A 20 percent chance of snow. Partly sunny, with a high near 11.
Friday Night
A 20 percent chance of snow. Mostly cloudy, with a low around -9.
Saturday
A 20 percent chance of snow. Partly sunny and cold, with a high near 3.
Saturday Night
A 30 percent chance of snow. Mostly cloudy, with a low around -11.
Sunday
A 20 percent chance of snow. Partly sunny and cold, with a high near 6.
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WSW Fort Atkinson WI
 42.88°N 88.93°W (Elev. 774 ft)
8:57 pm CST Jan 18, 2026
9pm CST Jan 18, 2026-6pm CST Jan 25, 2026
 
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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