NWS St. Louis Announces Changes To May 16, 2025 Tornado Damage Assessment

After a year-long review of new ground survey data and aerial imagery, NWS St. Louis made several adjustments to the May 16, 2025 tornado damage assessment. Read More >

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

68°F

20°C

Humidity 88%
Wind Speed SW 10 mph
Barometer 30.03 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 19 May 8:50 am CDT
Extended Forecast for

West Alton MO

Flood Watch May 19, 09:29am until May 19, 01:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch May 19, 09:29am until May 19, 01:00pm

    NOW until 1:00pm Tue

    Flood Watch

  • Today

    High: 77 °F

    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 4am, then a slight chance of showers.  Cloudy, with a low around 55. North wind 9 to 11 mph.  Chance of precipitation is 40%.

    Low: 55 °F

    Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: Partly sunny, with a high near 70. North wind around 10 mph.

    High: 70 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 50. Northeast wind around 8 mph.

    Low: 50 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 72. East wind 7 to 10 mph.

    High: 72 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A 50 percent chance of showers, mainly after 1am.  Mostly cloudy, with a low around 56.

    Low: 56 °F

    Slight Chance
    Showers then
    Chance
    Showers

  • Friday

    Friday: Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm.  High near 72. Chance of precipitation is 80%.

    High: 72 °F

    Showers

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms before 1am.  Mostly cloudy, with a low around 57.

    Low: 57 °F

    Slight Chance
    T-storms

Detailed Forecast

Today
A 50 percent chance of showers and thunderstorms, mainly before 5pm. Mostly cloudy, with a high near 77. South wind 9 to 14 mph becoming west in the afternoon. Winds could gust as high as 22 mph.
Tonight
A chance of showers and thunderstorms before 4am, then a slight chance of showers. Cloudy, with a low around 55. North wind 9 to 11 mph. Chance of precipitation is 40%.
Wednesday
Partly sunny, with a high near 70. North wind around 10 mph.
Wednesday Night
Mostly cloudy, with a low around 50. Northeast wind around 8 mph.
Thursday
Mostly cloudy, with a high near 72. East wind 7 to 10 mph.
Thursday Night
A 50 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 56.
Friday
Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. High near 72. Chance of precipitation is 80%.
Friday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 57.
Saturday
Partly sunny, with a high near 80.
Saturday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 59.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83.
Sunday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Memorial Day
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 86.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
West Alton MO
 38.86°N 90.22°W (Elev. 427 ft)
8:46 am CDT May 19, 2026
9am CDT May 19, 2026-6pm CDT May 25, 2026
 
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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