Severe Thunderstorms and Heavy Rain in the Mid-Atlantic; Heat Persists Across the South

Scattered severe thunderstorms and excessive rainfall are possible into the night in the Mid Atlantic, and heavy rain will shift to Virginia and the Carolinas on Friday. Severe thunderstorms are also possible in the Central Plains into the Upper MS Valley and the Deep South tonight. Dangerous heat persists across the Southern Plains and Lower MS Valley and heat will expand into the Southwest. Read More >

Current conditions at

Patterson Memorial (KPTN)

Lat: 29.72°NLon: 91.33°WElev: 10ft.

Fair

79°F

26°C

Humidity NA
Wind Speed Calm
Barometer 30.00 in (1016.0 mb)
Dewpoint N/A
Visibility 10.00 mi
Last update 21 Aug 3:56 am CDT
Extended Forecast for

Bayou Vista LA

Extreme Heat Warning August 21, 10:00am until August 21, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  • Today

    Today: A 30 percent chance of showers and thunderstorms after 5pm.  Mostly sunny, with a high near 94. Heat index values as high as 113. Calm wind becoming west around 5 mph in the morning.

    High: 94 °F

    Sunny then
    Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 3am.  Partly cloudy, with a low around 79. Southwest wind around 5 mph becoming calm  after midnight.  Chance of precipitation is 20%.

    Low: 79 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly between 3pm and 5pm.  Mostly sunny, with a high near 96. Heat index values as high as 113. West wind around 5 mph.

    High: 96 °F

    Mostly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 79. Southwest wind around 5 mph becoming calm  in the evening.

    Low: 79 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm.  Sunny and hot, with a high near 97. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 97 °F

    Sunny then
    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 79. Southwest wind around 5 mph becoming calm.

    Low: 79 °F

    Partly Cloudy

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms after 1pm.  Sunny, with a high near 94. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 94 °F

    Sunny then
    Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 77. Southwest wind around 5 mph becoming calm.

    Low: 77 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 92. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 92 °F

    Mostly Sunny
    then Chance
    T-storms

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 94. Heat index values as high as 113. Calm wind becoming west around 5 mph in the morning.
Tonight
A slight chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 3am. Partly cloudy, with a low around 79. Southwest wind around 5 mph becoming calm after midnight. Chance of precipitation is 20%.
Saturday
A 30 percent chance of showers and thunderstorms, mainly between 3pm and 5pm. Mostly sunny, with a high near 96. Heat index values as high as 113. West wind around 5 mph.
Saturday Night
Partly cloudy, with a low around 79. Southwest wind around 5 mph becoming calm in the evening.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 97. Calm wind becoming southwest around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 79. Southwest wind around 5 mph becoming calm.
Monday
A 40 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 94. Calm wind becoming southwest around 5 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 77. Southwest wind around 5 mph becoming calm.
Tuesday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92. Calm wind becoming southwest around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 77.
Wednesday
A 40 percent chance of showers and thunderstorms. Sunny, with a high near 92.
Wednesday Night
Partly cloudy, with a low around 76.
Thursday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
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ABOUT THIS FORECAST

 
Point Forecast:
Bayou Vista LA
 29.68°N 91.28°W
2:45 am CDT Aug 21, 2026
4am CDT Aug 21, 2026-6pm CDT Aug 27, 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