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Heavy Rain in the Appalachians and Central Gulf Coast; Heat Continues in the West; Monitoring the Tropics

Heavy to excessive rainfall over the southern Appalachians and portions of the central Gulf Coast may bring areas of flooding today. Hot temperatures are in place through today across much of the western U.S. and New England. Tropical Storm Erin is forecast to become a Major Hurricane this weekend as it moves across the central Atlantic Ocean. Monitor future forecasts for any East Coast impacts. Read More >

Hazardous Weather Conditions

Current conditions at

Grinnell Municipal Airfield (KGGI)

Lat: 41.71°NLon: 92.73°WElev: 1007ft.

Overcast

71°F

22°C

Humidity 100%
Wind Speed Calm
Barometer 29.98 in
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 12 Aug 8:35 am CDT
Extended Forecast for

3 Miles S Chelsea IA

  • Today

    Today: A 20 percent chance of showers and thunderstorms. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 82. Calm wind becoming west 5 to 7 mph in the afternoon.

    High: 82 °F

    Slight Chance
    T-storms and
    Patchy Fog

  • Tonight

    Tonight: A slight chance of showers before 9pm, then a chance of sprinkles between 9pm and 11pm. Mostly clear, with a low around 58. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 58 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 79. Light north wind.

    High: 79 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 59. Calm wind.

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 81. Calm wind becoming south southeast 5 to 8 mph in the morning.

    High: 81 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 82. Calm wind becoming west 5 to 7 mph in the afternoon.
Tonight
A slight chance of showers before 9pm, then a chance of sprinkles between 9pm and 11pm. Mostly clear, with a low around 58. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Wednesday
Sunny, with a high near 79. Light north wind.
Wednesday Night
Mostly clear, with a low around 59. Calm wind.
Thursday
Sunny, with a high near 81. Calm wind becoming south southeast 5 to 8 mph in the morning.
Thursday Night
Mostly clear, with a low around 65.
Friday
Mostly sunny, with a high near 87.
Friday Night
Partly cloudy, with a low around 71.
Saturday
Mostly sunny, with a high near 90.
Saturday Night
Partly cloudy, with a low around 71.
Sunday
Mostly sunny, with a high near 88.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Monday
A 30 percent chance of showers. Mostly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S Chelsea IA
 41.88°N 92.39°W
Last Update:
6:36 am CDT Aug 12, 2025
Forecast Valid:
8am CDT Aug 12, 2025-6pm CDT Aug 18, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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