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

Excessive Rainfall and Potential Tropical Cyclone in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce locally considerable flash flooding over parts of the northwestern Gulf Coast, lower Mississippi River Valley, and Deep South through Thursday. Potential Tropical Cyclone One is forecast to become a tropical storm (Arthur) as it moves along or just off the northwestern Gulf coast through Wednesday. An outbreak of severe weather is forecast in the Midwest Wednesday. Read More >

Hazardous Weather Conditions

Current conditions at

Fort Madison Municipal Airport (KFSW)

Lat: 40.66°NLon: 91.33°WElev: 719ft.

Thunderstorm in Vicinity Rain

61°F

16°C

Humidity 77%
Wind Speed SE 16 G 22 mph
Barometer 29.42 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 17 Jun 7:15 am CDT
Extended Forecast for

Donnellson IA

Severe T-storm Watch until June 17, 11:00am
Click here for hazard details and duration
...
  •  
    Severe T-storm Watch until June 17, 11:00am

    NOW until 11:00am Wed

    Severe T-storm Watch

  • Today

    High: 86 °F

    Severe
    Thunderstorms
    then Showers
    Likely

  • Tonight

    Tonight: Mostly clear, with a low around 61. West wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 61 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 78. Northwest wind around 10 mph, with gusts as high as 20 mph.

    High: 78 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 55. Northwest wind around 5 mph becoming calm in the evening.

    Low: 55 °F

    Mostly Clear

  • Juneteenth

    Juneteenth: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. Chance of precipitation is 70%.

    Low: 64 °F

    Partly Cloudy
    then Showers
    Likely

Detailed Forecast

Today
Showers and thunderstorms, mainly before 2pm. Some of the storms could be severe. High near 86. Southeast wind around 15 mph becoming west in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Tonight
Mostly clear, with a low around 61. West wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday
Mostly sunny, with a high near 78. Northwest wind around 10 mph, with gusts as high as 20 mph.
Thursday Night
Mostly clear, with a low around 55. Northwest wind around 5 mph becoming calm in the evening.
Juneteenth
Sunny, with a high near 82.
Friday Night
Partly cloudy, with a low around 62.
Saturday
Mostly sunny, with a high near 86.
Saturday Night
Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. Chance of precipitation is 70%.
Sunday
Showers and possibly a thunderstorm. High near 79. Chance of precipitation is 90%.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 60.
Monday
Mostly sunny, with a high near 78.
Monday Night
Partly cloudy, with a low around 58.
Tuesday
Mostly sunny, with a high near 81.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Donnellson IA
 40.66°N 91.56°W (Elev. 699 ft)
Last Update:
6:57 am CDT Jun 17, 2026
Forecast Valid:
7am CDT Jun 17, 2026-6pm CDT Jun 23, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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