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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

Waterloo, Waterloo Municipal Airport (KALO)

Lat: 42.55°NLon: 92.4°WElev: 873ft.

Mostly Cloudy

71°F

22°C

Humidity 94%
Wind Speed SE 12 mph
Barometer 29.94 in (1013.3 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 18 Aug 5:54 am CDT
Extended Forecast for

Allison IA

  • Today

    Today: Showers and thunderstorms likely, mainly before 11am. Partly sunny, with a high near 86. South southeast wind 6 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 86 °F

    Showers
    Likely then
    Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 70. West southwest wind around 6 mph becoming light and variable in the evening.

    Low: 70 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: Mostly sunny, with a high near 83. North wind 5 to 8 mph.

    High: 83 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 62. North wind 5 to 7 mph.

    Low: 62 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 79. Northeast wind 5 to 7 mph.

    High: 79 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

Detailed Forecast

Today
Showers and thunderstorms likely, mainly before 11am. Partly sunny, with a high near 86. South southeast wind 6 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
A 20 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 70. West southwest wind around 6 mph becoming light and variable in the evening.
Tuesday
Mostly sunny, with a high near 83. North wind 5 to 8 mph.
Tuesday Night
Mostly clear, with a low around 62. North wind 5 to 7 mph.
Wednesday
Sunny, with a high near 79. Northeast wind 5 to 7 mph.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
Sunny, with a high near 78.
Thursday Night
Mostly clear, with a low around 58.
Friday
Mostly sunny, with a high near 79.
Friday Night
Mostly clear, with a low around 57.
Saturday
Sunny, with a high near 74.
Saturday Night
Mostly clear, with a low around 50.
Sunday
Sunny, with a high near 68.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Allison IA
 42.73°N 92.79°W
Last Update:
6:05 am CDT Aug 18, 2025
Forecast Valid:
6am CDT Aug 18, 2025-6pm CDT Aug 24, 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