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

Excessive Rainfall and Severe Thunderstorms Threaten the Southern U.S. Again Thursday

A Moderate Risk (Level 3 of 4) Excessive Rainfall Outlook and Flood Watches have been issued for portions of east Texas into Louisiana Thursday where flash, urban, and riverine flooding is possible. A Slight Risk (Level 2 of 5) for scattered severe thunderstorms has been issued from west Texas to the lower Mississippi Valley Thursday afternoon into Thursday night. Read More >

Current conditions at

Galliano, South Lafourche Airport (KGAO)

Lat: 29.44°NLon: 90.26°WElev: 0ft.

Fog/Mist

74°F

23°C

Humidity 86%
Wind Speed E 3 mph
Barometer 29.74 in
Dewpoint 70°F (21°C)
Visibility 3.00 mi
Last update 17 May 4:15 am CDT
Extended Forecast for

Grand Isle LA

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms, mainly before 5am. Mostly cloudy, with a steady temperature around 78. Breezy, with a south wind around 20 mph.

    Low: 78 °F

    Chance
    T-storms and
    Breezy

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 2pm. Some of the storms could be severe. Partly sunny, with a high near 82. Breezy, with a south wind 15 to 20 mph.

    High: 82 °F

    Partly Sunny
    and Breezy
    then Severe
    Thunderstorms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Some of the storms could be severe. Mostly cloudy, with a low around 74. South wind 10 to 15 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 74 °F

    Severe
    Thunderstorms

  • Saturday

    Saturday: Showers and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. High near 80. South wind around 10 mph. Chance of precipitation is 80%.

    High: 80 °F

    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 75. South wind around 5 mph becoming west after midnight.

    Low: 75 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: Sunny, with a high near 84. North wind around 5 mph becoming southeast in the afternoon.

    High: 84 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 76. Southwest wind around 5 mph.

    Low: 76 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 83. Southeast wind around 5 mph.

    High: 83 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 77. South wind 5 to 10 mph.

    Low: 77 °F

    Mostly Clear

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms, mainly before 5am. Mostly cloudy, with a steady temperature around 78. Breezy, with a south wind around 20 mph.
Friday
A 20 percent chance of showers and thunderstorms after 2pm. Some of the storms could be severe. Partly sunny, with a high near 82. Breezy, with a south wind 15 to 20 mph.
Friday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Some of the storms could be severe. Mostly cloudy, with a low around 74. South wind 10 to 15 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
Showers and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. High near 80. South wind around 10 mph. Chance of precipitation is 80%.
Saturday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 75. South wind around 5 mph becoming west after midnight.
Sunday
Sunny, with a high near 84. North wind around 5 mph becoming southeast in the afternoon.
Sunday Night
Mostly clear, with a low around 76. Southwest wind around 5 mph.
Monday
Sunny, with a high near 83. Southeast wind around 5 mph.
Monday Night
Mostly clear, with a low around 77. South wind 5 to 10 mph.
Tuesday
Sunny, with a high near 82. South wind around 10 mph.
Tuesday Night
Mostly clear, with a low around 78. Southeast wind 10 to 15 mph.
Wednesday
Sunny, with a high near 83. South wind around 10 mph.
Wednesday Night
Partly cloudy, with a low around 78. South wind around 10 mph.
Thursday
Mostly sunny, with a high near 82. South wind around 10 mph.
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Map Legend

ABOUT THIS FORECAST

 
Point Forecast:
Grand Isle LA
 29.23°N 89.99°W
Last Update:
3:51 am CDT May 17, 2024
Forecast Valid:
4am CDT May 17, 2024-6pm CDT May 23, 2024
 
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