On July 7, 2015, NWS implemented changes to the icons depicted on all of its point-forecast pages. Changes include new icon images with increased clarity, 6-hour increments for rapidly changing weather and new color blocks to highlight forecast hazards.

A page depicting all of the new icon images can be accessed here: www.weather.gov/forecast-icons

Changes to the icons were based on analysis of 6,700 public comments collected in 2014. Also, many of these changes are based on the results of a research project led by the National Center for Atmospheric Research.

Users are encouraged to continue to provide comments regarding these changes via email at icons@noaa.gov. NWS will continue to analyze incoming feedback and refine the icons as necessary. Any substantial change to the icons will be facilitated through the NWS public comment/review process.

A Slight Risk of Severe Thunderstorms into Tonight

Severe thunderstorms may develop and move southeastward this evening and tonight across parts of the north-central Plains and Upper Midwest, offering damaging wind, severe hail and the risk of a few tornadoes. A few thunderstorms may drop hail and damaging gusts near severe levels in New England.
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Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

86°F

30°C

Humidity 39%
Wind Speed SE 6 mph
Barometer 30.04 in (1016.8 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 1 Aug 12:53 pm CDT
Extended Forecast for

Herculaneum MO

Flood Warning until Monday 04:00am
Click here for hazard details and duration
Flood Warning
  •  
    Flood Warning until Monday 04:00am

    NOW until
    4:00am Mon

    Flood Warning

  • This
    Afternoon

    This Afternoon: Sunny, with a high near 92. Calm wind.

    Sunny

    High: 92 °F

  • Tonight

    Tonight: Mostly clear, with a low around 69. Light and variable wind.

    Mostly Clear

    Low: 69 °F

  • Sunday

    Sunday: Mostly sunny, with a high near 93. Southwest wind 3 to 7 mph.

    Mostly Sunny

    High: 93 °F

  • Sunday
    Night

    Sunday Night: Partly cloudy, with a low around 71. Southwest wind 3 to 5 mph.

    Partly Cloudy

    Low: 71 °F

  • Monday

    Monday: Sunny, with a high near 92. Northwest wind 3 to 5 mph.

    Sunny

    High: 92 °F

  • Monday
    Night

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

    Partly Cloudy

    Low: 71 °F

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms.  Partly sunny, with a high near 91.

    Chance
    T-storms

    High: 91 °F

  • Tuesday
    Night

    Tuesday Night: Showers and thunderstorms likely.  Mostly cloudy, with a low around 70. Chance of precipitation is 60%.

    T-storms
    Likely

    Low: 70 °F

Detailed Forecast

This Afternoon
Sunny, with a high near 92. Calm wind.
Tonight
Mostly clear, with a low around 69. Light and variable wind.
Sunday
Mostly sunny, with a high near 93. Southwest wind 3 to 7 mph.
Sunday Night
Partly cloudy, with a low around 71. Southwest wind 3 to 5 mph.
Monday
Sunny, with a high near 92. Northwest wind 3 to 5 mph.
Monday Night
Partly cloudy, with a low around 71.
Tuesday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 91.
Tuesday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 70. Chance of precipitation is 60%.
Wednesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 84.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Thursday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
Thursday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Friday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.
  Click Map For Forecast
Point Forecast:
Herculaneum MO
 38.27°N 90.39°W (Elev. 456 ft)
10:41 am CDT Aug 1, 2015
1pm CDT Aug 1, 2015-6pm CDT Aug 7, 2015
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Graph

National Digital Forecast Database