National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Severe Thunderstorms and Flash Flooding in the Central U.S.; A Dangerous Heatwave Coming to the West

A slow moving cold front will bring multiple rounds of widespread heavy rain, localized flash flooding, and severe thunderstorms from the central Plains into the Great Lakes through Saturday. A dangerous heatwave with record breaking and triple digit temperatures is expected this weekend into next week over the Northwest U.S. Excessive Heat Watches and Warnings have been issued. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Partly Cloudy

77°F

25°C

Humidity 88%
Wind Speed SE 10 mph
Barometer 29.94 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 24 Jun 11:55 pm CDT
Extended Forecast for

Pontoon Beach IL

Flash Flood Watch until June 26, 07:00am
Tornado Watch until June 25, 04:00am
Click here for hazard details and duration
Flash Flood Watch
Tornado Watch
  •  
    Flash Flood Watch until June 26, 07:00am
    Tornado Watch until June 25, 04:00am

    NOW: Multiple
    hazards in effect

    Click HERE for Details

  • Overnight

    Overnight: Showers and thunderstorms, mainly after 2am. Some storms could be severe, with large hail, damaging winds, and heavy rain. Low around 74. South wind 9 to 13 mph. Chance of precipitation is 80%.

    Severe
    Thunderstorms

    Low: 74 °F

  • Friday

    Friday: Showers and thunderstorms likely, mainly after 3pm. Some of the storms could produce heavy rain. Cloudy, with a high near 90. Heat index values as high as 101. South wind 10 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 70%.

    Heavy Rain

    High: 90 °F

  • Friday
    Night

    Friday Night: Showers and thunderstorms, mainly before 3am. Some of the storms could produce heavy rain. Low around 75. South wind around 11 mph. Chance of precipitation is 80%.

    Heavy Rain

    Low: 75 °F

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 93. Heat index values as high as 100. South wind 10 to 15 mph, with gusts as high as 24 mph.

    Chance
    T-storms

    High: 93 °F

  • Saturday
    Night

    Saturday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74. South wind 7 to 13 mph, with gusts as high as 20 mph.

    Chance
    T-storms

    Low: 74 °F

  • Sunday

    Sunday: Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 90. Chance of precipitation is 70%.

    Chance
    T-storms then
    T-storms
    Likely

    High: 90 °F

  • Sunday
    Night

    Sunday Night: Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 72. Chance of precipitation is 60%.

    T-storms
    Likely

    Low: 72 °F

  • Monday

    Monday: Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 88. Chance of precipitation is 60%.

    T-storms
    Likely

    High: 88 °F

Detailed Forecast

Overnight
Showers and thunderstorms, mainly after 2am. Some storms could be severe, with large hail, damaging winds, and heavy rain. Low around 74. South wind 9 to 13 mph. Chance of precipitation is 80%.
Friday
Showers and thunderstorms likely, mainly after 3pm. Some of the storms could produce heavy rain. Cloudy, with a high near 90. Heat index values as high as 101. South wind 10 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 70%.
Friday Night
Showers and thunderstorms, mainly before 3am. Some of the storms could produce heavy rain. Low around 75. South wind around 11 mph. Chance of precipitation is 80%.
Saturday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 93. Heat index values as high as 100. South wind 10 to 15 mph, with gusts as high as 24 mph.
Saturday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74. South wind 7 to 13 mph, with gusts as high as 20 mph.
Sunday
Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 90. Chance of precipitation is 70%.
Sunday Night
Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 72. Chance of precipitation is 60%.
Monday
Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 88. Chance of precipitation is 60%.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71.
Tuesday
Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 87. Chance of precipitation is 60%.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.
Wednesday
Showers and thunderstorms likely. Partly sunny, with a high near 86. Chance of precipitation is 60%.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
Thursday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85.
Click Map For Forecast
Disclaimer
Map Legend
Point Forecast:
Pontoon Beach IL
 38.73°N 90.06°W (Elev. 423 ft)
Last Update:
12:11 am CDT Jun 25, 2021
Forecast Valid:
12am CDT Jun 25, 2021-6pm CDT Jun 30, 2021
 
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