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Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Hazardous Weather Conditions

Current conditions at

Atlantic (KAIO)

Lat: 41.4°NLon: 95.05°WElev: 1181ft.

Fair

90°F

32°C

Humidity 63%
Wind Speed S 16 mph
Barometer 29.96 in
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index101°F (38°C)
Last update 17 Aug 2:15 pm CDT
Extended Forecast for

Lewis IA

  • This Afternoon

    This Afternoon: Sunny, with a high near 92. Heat index values as high as 100. South southwest wind around 13 mph, with gusts as high as 18 mph.

    High: 92 °F

    Sunny

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms after 3am. Increasing clouds, with a low around 73. South wind 7 to 9 mph.

    Low: 73 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms, mainly before 10am. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 89. Heat index values as high as 100. South wind 7 to 11 mph becoming west southwest in the afternoon. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 89 °F

    Heavy Rain

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. South southwest wind around 6 mph becoming calm in the evening.

    Low: 69 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: Mostly sunny, with a high near 86. North northeast wind 3 to 7 mph.

    High: 86 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 92. Heat index values as high as 100. South southwest wind around 13 mph, with gusts as high as 18 mph.
Tonight
A 20 percent chance of showers and thunderstorms after 3am. Increasing clouds, with a low around 73. South wind 7 to 9 mph.
Monday
A 40 percent chance of showers and thunderstorms, mainly before 10am. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 89. Heat index values as high as 100. South wind 7 to 11 mph becoming west southwest in the afternoon. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. South southwest wind around 6 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 86. North northeast wind 3 to 7 mph.
Tuesday Night
Mostly clear, with a low around 64.
Wednesday
Sunny, with a high near 82.
Wednesday Night
Mostly clear, with a low around 60.
Thursday
Sunny, with a high near 81.
Thursday Night
Mostly clear, with a low around 60.
Friday
Sunny, with a high near 84.
Friday Night
Partly cloudy, with a low around 61.
Saturday
Mostly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lewis IA
 41.31°N 95.09°W
Last Update:
12:23 pm CDT Aug 17, 2025
Forecast Valid:
2pm CDT Aug 17, 2025-6pm CDT Aug 23, 2025
 
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