Our Proprietary 10-Day Forecast

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Current warnings over Grand Isle, Louisiana
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<p>Warnings from F5Weather</a></div>

United States weather warnings are issued by various organizations under NOAA. Most from the National Weather Service, but also Storm Prediction Center and National Hurricane Center.

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Current radar over Grand Isle, Louisiana red dot
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<p>Live radar from F5Weather</a></div>

Our radar is based off of US NEXRAD and Canadian weather radar sites through the quality controlled MRMS system. It compiles various sources for radar data and filters out erroneous returns such as sun spikes and ground clutter. We then colorize the precipitation based on our methods for determining precipitation type. Rain is in shades of green, mixed precipitation and freezing rain in shades of pink and snow is in shades of blue.

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Current satellite over Grand Isle, Louisiana red dot
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<p>Live satellite from F5Weather</a></div>

Our satellite is from the GOES-16. It is color enhanced by using a geocolor terrain background during the day and black marble city lights at night. The daytime satellite data is Visible satellite imagery, and nighttime uses Infrared bands. The bluish clouds are fog and low cloud. The whiteest clouds are the coldest, highest cloud tops.

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Current surface weather map around Jefferson County, LA

This surface map is from the HRRR computer model. It is a 1-hour forecast, updated hourly, which is a good estimate of the current surface conditions. This map shows the current high and low pressure centers, pressure isobar contours, wind streamlines and thickness contours. It also shows the currently depicted preciptiation estimates, although this should not be a substitute for actual live radar. The purple dashed contour is the 5400m thickness line, which is often a good proxy for the rain/snow line.

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Temperatures right now near Grand Isle, Louisiana

This is the latest surface temperatures as depicted by the HRRR computer model, updated hourly. Although these are not actual observations, this model is a very good representation of current conditions as it factors in observations, terrain and physics to give you more detailed temperatures in areas that do not have reporting weather stations. For the latest reports at specific locations, like in Grand Isle, LA please see our current conditions data on the left and right side of this page, or go to our current conditions page.

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Surface wind speed map over Grand Isle, LA

This map shows the latest HRRR computer model winds. This depiction of the current wind directions and speeds is an estimate from the computer model. For actual observations in Grand Isle, LA, see the current conditions data on the left and right side of this page, or go to our current conditions page.

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Regional 24 hour rainfall expected near Grand Isle, Louisiana

This is a forecast of the amount of precipitation expected over the next 24 hours from the HRRR weather forecast model. This is only one forecast depiction, and you should check other models to get a better idea of what may happen. You can view this and other models in more detail on our main weather forecast maps page. There, you will also be able to look at forecasts beyond just 24 hours and look at forecasts out to as far as 16 days.

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Area snowfall accumulation expected around Jefferson County, Louisiana

This is snowfall forecast, with amounts anticipated in the next 24 hours. This guidance is from the HRRR weather model. For more model forecasts out to 16 days, visit our main weather forecast maps page.

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These are Convective Outlooks from the Storm Prediction Center. Click to see Days 1-3 broken down into Tornado, Wind and Hail threats, as well as days 5-8 outlooks.

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Atlantic Hurricane and Tropical Storm Tracking Map
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<p>Hurricane Tracking from F5Weather</a></div>

Our hurricane tracking map monitors for any current or forecast tropical disturbances in the Atlantic. (See our Pacific Hurricane Tracker) Various hurricane models will draw a 'spaghetti plot' in the Atlantic Basin when a disturbance is forecast or exists, showing the system's forecast track. Once a storm has developed, the National Hurricane Center will forecast their official track. This will show up on the map along with the storm's current intensity, track and name. We will also plot some of the storm's vitals and of course the spaghetti plots from the models along with the NHC forecast track will give you an idea of where it's heading, and its forecast intensity with time.

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To view the latest computer models, visit f5wx.com for access to the weather maps and guidance that meteorologists use to make their forecasts.
 
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View Skew-T soundings, textual data tables for your location, and of course maps! Weather forecast maps of the basics like temperature, wind, pressure, humidity, dew point, cloud cover, simulated radar, travel weather, rainfall and snow are available. More advanced users can also get use out of our severe weather & tornado threat maps, as well as upper air & shear graphics.
 
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Climate Summary
(made with AI, use with caution)
Grand Isle, Louisiana Climate Summary

General Climate

    •   Subtropical climate, with hot, humid summers and mild winters.
    •   Average annual temperature: 70.7°F (21.5°C)
    •   Average annual precipitation: 66.6 inches (169.2 cm)
    •   Average annual snowfall: 0.1 inches (0.3 cm)

Summer (June-August)

    •   Average high temperature: 90.4°F (32.4°C)
    •   Average low temperature: 76.2°F (24.6°C)
    •   Average precipitation: 18.4 inches (46.7 cm)
    •   High humidity and frequent thunderstorms

Winter (December-February)

    •   Average high temperature: 59.2°F (15.1°C)
    •   Average low temperature: 42.5°F (5.8°C)
    •   Average precipitation: 10.6 inches (26.9 cm)
    •   Occasional cold fronts and frost

Spring (March-May)

    •   Average high temperature: 77.2°F (25.1°C)
    •   Average low temperature: 59.2°F (15.1°C)
    •   Average precipitation: 13.9 inches (35.3 cm)
    •   Increasing humidity and occasional severe weather

Fall (September-November)

    •   Average high temperature: 83.3°F (28.5°C)
    •   Average low temperature: 64.5°F (18.1°C)
    •   Average precipitation: 13.7 inches (34.8 cm)
    •   Decreasing humidity and occasional tropical storms

Other Notable Climate Features

    •   Grand Isle is located in a hurricane-prone area and has experienced several major hurricanes in recent years.
    •   The area is also prone to flooding, especially during heavy rainfall events.
    •   Sea level rise is a growing concern for Grand Isle and other coastal communities in Louisiana.

Facts & Historical Information
(made with AI, use with caution)
Natural History

    •   Grand Isle is the largest barrier island in Louisiana, spanning 7 miles long and 2 miles wide.

    •   It's home to a diverse ecosystem, including salt marshes, beaches, and coastal forests.

    •   The island is a nesting site for sea turtles, including the endangered Kemp's ridley.

Science

    •   Grand Isle has been a hub for scientific research due to its unique environment.

    •   The Louisiana Universities Marine Consortium has a research station on the island, studying coastal ecology and marine biology.

    •   The island has been used as a site for hurricane research and coastal restoration projects.

Personalities

  • Jean Lafitte:

    The pirate and privateer is believed to have used Grand Isle as a base of operations.

  • Dr. John Morgan:

    A prominent physician and scientist, he established a quarantine station on the island in the 1800s.

  • Henry C. Warmoth:

    The former governor of Louisiana owned a plantation on Grand Isle and played a role in its development.

    • Tourist Attractions
    1. Grand Isle State Park: This park offers a beautiful beach, fishing piers, and hiking trails. It is a great place to relax and enjoy the outdoors.

    2. Elmer's Island: This small island is located just off the coast of Grand Isle. It is a popular spot for fishing, crabbing, and birdwatching.

    3. Jean Lafitte National Historical Park and Preserve: This park is located about 30 miles from Grand Isle. It is home to the Barataria Preserve, which is a large wetland area that is home to a variety of wildlife. The park also includes the Chalmette Battlefield, which was the site of a major battle during the War of 1812.

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