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

Winter Storm to Impact the Region Sunday Afternoon - Monday Morning

A strong winter storm moves through the region Sunday afternoon through Monday morning. The combination of moderate to heavy snow, strong northwest winds, and falling temperatures may lead to hazardous travel conditions for much of the area. The greatest impacts in Wisconsin are expected to be along and north of I-90, while blizzard conditions are possible west of the Mississippi River. Read More >

Hazardous Weather Conditions

Current conditions at

Decorah (KDEH)

Lat: 43.28°NLon: 91.73°WElev: 1158ft.

Freezing Fog

32°F

0°C

Humidity 100%
Wind Speed S 9 mph
Barometer 29.88 in
Dewpoint 32°F (0°C)
Visibility 0.25 mi
Wind Chill24°F (-4°C)
Last update 27 Dec 5:15 am CST
Extended Forecast for

Calmar IA

Winter Weather Advisory December 28, 03:00pm until December 29, 12:00pm
Dense Fog Advisory December 27, 05:39am until December 27, 12:00pm
Click here for hazard details and duration
Winter Weather Advisory
Dense Fog Advisory
  •  
    Dense Fog Advisory December 27, 05:39am until December 27, 12:00pm

    NOW until 12:00pm Sat

    Dense Fog Advisory

  • Today

    High: 42 °F

    Dense Fog

  • Tonight

    Tonight: A slight chance of rain before 3am, then a slight chance of rain after 5am. Cloudy, with a low around 39. Southeast wind 5 to 8 mph becoming light and variable after midnight. Chance of precipitation is 20%.

    Low: 39 °F

    Slight Chance
    Rain

  • Sunday

    Sunday: Snow, possibly mixed with rain, becoming all snow after 3pm. Patchy blowing snow after 3pm. Temperature falling to around 23 by 5pm. Breezy, with a northwest wind 5 to 15 mph increasing to 15 to 25 mph in the afternoon. Winds could gust as high as 37 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    High: 41 °F⇓

    Rain then
    Rain/Snow and
    Patchy
    Blowing Snow

  • Sunday Night

    Sunday Night: Snow likely. Widespread blowing snow, mainly after 1am. Cloudy, with a low around 8. Wind chill values as low as -13. Windy, with a northwest wind 26 to 28 mph, with gusts as high as 40 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.

    Low: 8 °F

    Snow Likely
    and Blowing
    Snow

  • Monday

    Monday: A 30 percent chance of snow before noon. Areas of blowing snow before noon. Partly sunny, with a high near 12. Windy, with a northwest wind 20 to 26 mph, with gusts as high as 38 mph.

    High: 12 °F

    Chance Snow
    and Areas
    Blowing Snow

  • Monday Night

    Monday Night: Mostly clear, with a low around 3. Blustery, with a northwest wind 8 to 18 mph.

    Low: 3 °F

    Mostly Clear
    and Blustery
    then Mostly
    Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 25. Southwest wind 8 to 11 mph, with gusts as high as 20 mph.

    High: 25 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 15. Northwest wind 11 to 14 mph.

    Low: 15 °F

    Mostly Cloudy

Detailed Forecast

Today
Widespread dense fog, mainly before 10am. Otherwise, cloudy, with a high near 42. Southeast wind 9 to 13 mph, with gusts as high as 23 mph.
Tonight
A slight chance of rain before 3am, then a slight chance of rain after 5am. Cloudy, with a low around 39. Southeast wind 5 to 8 mph becoming light and variable after midnight. Chance of precipitation is 20%.
Sunday
Snow, possibly mixed with rain, becoming all snow after 3pm. Patchy blowing snow after 3pm. Temperature falling to around 23 by 5pm. Breezy, with a northwest wind 5 to 15 mph increasing to 15 to 25 mph in the afternoon. Winds could gust as high as 37 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Sunday Night
Snow likely. Widespread blowing snow, mainly after 1am. Cloudy, with a low around 8. Wind chill values as low as -13. Windy, with a northwest wind 26 to 28 mph, with gusts as high as 40 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.
Monday
A 30 percent chance of snow before noon. Areas of blowing snow before noon. Partly sunny, with a high near 12. Windy, with a northwest wind 20 to 26 mph, with gusts as high as 38 mph.
Monday Night
Mostly clear, with a low around 3. Blustery, with a northwest wind 8 to 18 mph.
Tuesday
Partly sunny, with a high near 25. Southwest wind 8 to 11 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly cloudy, with a low around 15. Northwest wind 11 to 14 mph.
Wednesday
A 20 percent chance of snow after noon. Mostly cloudy, with a high near 22. Northwest wind 11 to 14 mph.
Wednesday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 0. Northwest wind around 11 mph.
New Year's Day
Sunny, with a high near 7. Northwest wind 9 to 11 mph.
Thursday Night
Mostly clear, with a low around -4. West wind around 8 mph.
Friday
Sunny, with a high near 14. West wind around 8 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Calmar IA
 43.17°N 91.86°W
Last Update:
5:11 am CST Dec 27, 2025
Forecast Valid:
5am CST Dec 27, 2025-6pm CST Jan 2, 2026
 
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Additional Resources

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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