Hurricane Isaias threatens Florida Panhandle, Alabama and Mississippi with flooding and storm surge

Hurricane Isaias is moving toward the northern Gulf Coast of the United States, with forecasters warning that it could make landfall in parts of the Florida Panhandle, southern Alabama and southern Mississippi late Friday or early Saturday. The storm has intensified over unusually warm Gulf waters and is already prompting school closures and local government shutdowns in areas expected to be affected. Officials say low-lying communities face a particular risk from flooding and storm surge.

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The Miami-based National Hurricane Center said on Thursday that a hurricane watch has been issued from Bay St. Louis, Mississippi, to Indian Pass in northwestern Florida. It warned residents in likely impact zones to complete emergency life-safety and property protections without delay.

The centre said rainfall totals of 3 to 6 inches are forecast, with isolated areas potentially receiving up to 10 inches, raising the risk of localised flash flooding and urban flooding. In a Thursday morning update, National Hurricane Center director Michael Brennan said the storm was expected to be a dangerous hurricane at landfall and could strengthen to near-major hurricane intensity by Friday. On Thursday morning, Isaias was packing maximum sustained winds of nearly 130 km/h, or 80 mph, with higher gusts.

Heavy rain is also expected inland through the weekend, with impacts potentially extending into the Tennessee Valley and parts of the southern Appalachian Mountains. The storm matters not only because of the immediate threat to coastal communities, but also because it is the first hurricane of the Atlantic season. That makes it an early test for emergency planners across the Gulf Coast, where storm surge and flooding can quickly overwhelm low-lying areas.

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The forecast track also places several states in the path of a system that could disrupt transport, local services and power supplies over a broad region. There are already signs of wider economic disruption. Ahead of the storm, oil and gas producers shut down a significant share of offshore production in the US Gulf, which accounts for almost 15 percent of crude pumped annually in the country.

By Wednesday, about 25 percent of regional oil production had been temporarily halted, removing about 511,000 barrels a day from the market, according to the Marine Minerals Administration. Eight of the Gulf's 371 manned oil platforms had also been evacuated. What remains unclear is the exact landfall point and how quickly the storm will intensify before reaching the coast.

Forecasters will be watching the strength of the winds, the amount of rain that falls and the extent of storm surge in the coming hours. The scale of disruption to schools, local government operations and offshore energy production will also depend on how long the system remains over the Gulf and how far inland the heaviest rain spreads.

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