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

Hazardous Weather Conditions

Current conditions at

Mason City Municipal Airport (KMCW)

Lat: 43.15°NLon: 93.33°WElev: 1188ft.

Overcast

28°F

-2°C

Humidity 85%
Wind Speed NE 6 mph
Barometer 30.08 in (1019.5 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 14 Mar 3:53 am CDT
Extended Forecast for

Thornton IA

Winter Storm Watch March 15, 01:00am until March 16, 10:00am
High Wind Watch March 15, 01:00pm until March 16, 04:00am
Click here for hazard details and duration
Winter Storm Watch
High Wind Watch

  • Overnight

    Overnight: A 20 percent chance of snow. Mostly cloudy, with a low around 27. Light east wind.

    Low: 27 °F

    Slight Chance
    Snow

  • Saturday

    Saturday: A 20 percent chance of snow before noon. Mostly cloudy, with a high near 42. Breezy, with a southeast wind 6 to 11 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 24 mph.

    High: 42 °F

    Slight Chance
    Snow then
    Mostly Cloudy
    and Breezy

  • Saturday Night

    Saturday Night: A slight chance of snow before 9pm, then rain. Some thunder is also possible. Low around 30. Windy, with an east southeast wind 18 to 23 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    Low: 30 °F

    Windy. Chance
    Rain/Snow
    then Rain

  • Sunday

    Sunday: Rain, snow, freezing rain, and sleet before 2pm, then snow, possibly mixed with sleet between 2pm and 4pm, then snow after 4pm. Widespread blowing snow, mainly after 4pm. Temperature falling to around 28 by 5pm. Very windy, with an east wind 18 to 28 mph becoming north 30 to 40 mph in the morning. Winds could gust as high as 50 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. New snow and sleet accumulation of 1 to 3 inches possible.

    High: 36 °F⇓

    Wintry Mix
    and Blowing
    Snow

  • Sunday Night

    Sunday Night: Snow likely, mainly before 1am. Widespread blowing snow. Cloudy, with a low around 4. Very windy, with a north northwest wind 39 to 43 mph, with gusts as high as 50 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.

    Low: 4 °F

    Snow Likely
    and Blowing
    Snow

  • Monday

    Monday: Widespread blowing snow, mainly before noon. Partly sunny, with a high near 12. Windy.

    High: 12 °F

    Blowing Snow
    and Windy

  • Monday Night

    Monday Night: Patchy blowing snow before 7pm. Mostly clear, with a low around 0. Windy.

    Low: 0 °F

    Patchy
    Blowing Snow
    and Windy
    then Mostly
    Clear

  • Tuesday

    Tuesday: A 30 percent chance of snow after 1pm. Partly sunny, with a high near 27.

    High: 27 °F

    Mostly Sunny
    then Chance
    Snow

  • Tuesday Night

    Tuesday Night: Snow likely before 1am. Mostly cloudy, with a low around 20. Breezy. Chance of precipitation is 70%.

    Low: 20 °F

    Snow Likely
    and Breezy

Detailed Forecast

Overnight
A 20 percent chance of snow. Mostly cloudy, with a low around 27. Light east wind.
Saturday
A 20 percent chance of snow before noon. Mostly cloudy, with a high near 42. Breezy, with a southeast wind 6 to 11 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 24 mph.
Saturday Night
A slight chance of snow before 9pm, then rain. Some thunder is also possible. Low around 30. Windy, with an east southeast wind 18 to 23 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Sunday
Rain, snow, freezing rain, and sleet before 2pm, then snow, possibly mixed with sleet between 2pm and 4pm, then snow after 4pm. Widespread blowing snow, mainly after 4pm. Temperature falling to around 28 by 5pm. Very windy, with an east wind 18 to 28 mph becoming north 30 to 40 mph in the morning. Winds could gust as high as 50 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. New snow and sleet accumulation of 1 to 3 inches possible.
Sunday Night
Snow likely, mainly before 1am. Widespread blowing snow. Cloudy, with a low around 4. Very windy, with a north northwest wind 39 to 43 mph, with gusts as high as 50 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.
Monday
Widespread blowing snow, mainly before noon. Partly sunny, with a high near 12. Windy.
Monday Night
Patchy blowing snow before 7pm. Mostly clear, with a low around 0. Windy.
Tuesday
A 30 percent chance of snow after 1pm. Partly sunny, with a high near 27.
Tuesday Night
Snow likely before 1am. Mostly cloudy, with a low around 20. Breezy. Chance of precipitation is 70%.
Wednesday
Mostly sunny, with a high near 46.
Wednesday Night
Partly cloudy, with a low around 32.
Thursday
Mostly sunny, with a high near 58.
Thursday Night
Partly cloudy, with a low around 35.
Friday
Partly sunny, with a high near 59.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Thornton IA
 42.95°N 93.37°W
Last Update:
3:17 am CDT Mar 14, 2026
Forecast Valid:
4am CDT Mar 14, 2026-6pm CDT Mar 20, 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