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

Sparta, Sparta / Fort McCoy Airport (KCMY)

Lat: 43.96°NLon: 90.74°WElev: 837ft.

Light Unknown Precip

12°F

-11°C

Humidity 83%
Wind Speed Calm
Barometer 29.82 in (1012.6 mb)
Dewpoint 8°F (-13°C)
Visibility 2.75 mi
Last update 18 Jan 7:55 pm CST
Extended Forecast for

Tomah WI

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

    Tonight: A 40 percent chance of snow, mainly before 10pm.  Mostly cloudy, with a low around -8. Wind chill values as low as -27. Blustery, with a northwest wind 10 to 18 mph, with gusts as high as 33 mph.  Total nighttime snow accumulation of less than a half inch possible.

    Low: -8 °F

    Blustery.
    Chance Snow
    then Mostly
    Cloudy

  • M.L.King Day

    M.L.King Day: Partly sunny and cold, with a high near 2. Wind chill values as low as -29. Blustery, with a northwest wind 13 to 17 mph, with gusts as high as 31 mph.

    High: 2 °F

    Cold and
    Blustery

  • Monday Night

    Monday Night: Partly cloudy, with a low around -7. Wind chill values as low as -16. West wind 3 to 7 mph. Winds could gust as high as 20 mph.

    Low: -7 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 13. Wind chill values as low as -15. Light and variable wind becoming west around 6 mph.

    High: 13 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of snow.  Mostly cloudy, with a low around 4. Calm wind.  New snow accumulation of 1 to 2 inches possible.

    Low: 4 °F

    Chance Snow

  • Wednesday

    Wednesday: A 40 percent chance of snow.  Mostly cloudy, with a high near 20. Light west wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 21 mph.  New snow accumulation of less than a half inch possible.

    High: 20 °F

    Chance Snow

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 0. West wind around 8 mph, with gusts as high as 21 mph.

    Low: 0 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 12. West wind 6 to 10 mph, with gusts as high as 20 mph.

    High: 12 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around -5. West wind 3 to 5 mph.

    Low: -5 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 40 percent chance of snow, mainly before 10pm. Mostly cloudy, with a low around -8. Wind chill values as low as -27. Blustery, with a northwest wind 10 to 18 mph, with gusts as high as 33 mph. Total nighttime snow accumulation of less than a half inch possible.
M.L.King Day
Partly sunny and cold, with a high near 2. Wind chill values as low as -29. Blustery, with a northwest wind 13 to 17 mph, with gusts as high as 31 mph.
Monday Night
Partly cloudy, with a low around -7. Wind chill values as low as -16. West wind 3 to 7 mph. Winds could gust as high as 20 mph.
Tuesday
Mostly sunny, with a high near 13. Wind chill values as low as -15. Light and variable wind becoming west around 6 mph.
Tuesday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 4. Calm wind. New snow accumulation of 1 to 2 inches possible.
Wednesday
A 40 percent chance of snow. Mostly cloudy, with a high near 20. Light west wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 21 mph. New snow accumulation of less than a half inch possible.
Wednesday Night
Mostly cloudy, with a low around 0. West wind around 8 mph, with gusts as high as 21 mph.
Thursday
Partly sunny, with a high near 12. West wind 6 to 10 mph, with gusts as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around -5. West wind 3 to 5 mph.
Friday
A 20 percent chance of snow. Mostly sunny, with a high near 8. Northwest wind 5 to 7 mph.
Friday Night
Partly cloudy, with a low around -13. Northwest wind 3 to 5 mph.
Saturday
Mostly sunny and cold, with a high near 2. Northwest wind 3 to 7 mph.
Saturday Night
A 20 percent chance of snow. Mostly cloudy, with a low around -15. Northwest wind 3 to 5 mph.
Sunday
A 20 percent chance of snow. Partly sunny, with a high near 6. West wind 3 to 7 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Tomah WI
 43.99°N 90.51°W
7:57 pm CST Jan 18, 2026
8pm 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