Storm Barry sweeps into Louisiana threatening days of heavy downpours

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A huge storm forecasters warn is carrying “off the chart” amounts of moisture has made landfall on the US Gulf coast.

Tropical Storm Barry, which was downgraded from a category one hurricane as it came ashore at Intracoastal City, Louisiana, is causing downpours that could last for days in a test of flood-prevention efforts implemented after Hurricane Katrina devastated New Orleans 14 years ago.

The Coast Guard rescued more than a dozen people from the remote Isle de Jean Charles, south of New Orleans, where water rose so high that some residents clung to rooftops.

A levee in Plaquemines Parish, a finger of land extending deep into the Gulf of Mexico downstream from New Orleans, has already been topped by water.

Barry threatens disastrous flooding across a swath of the Gulf Coast.

But in New Orleans itself, officials remain confident its levees will hold firm, with most ranging in height from 20 to 25ft.

More than 70,000 customers are without power due to outages caused by the storm, including 66,830 in Louisiana and 3,140 in Mississippi.

National Hurricane Centre director Ken Graham, giving an update via Facebook Live, pointed to a computer screen showing a huge, swirling mess of airborne water.

Hurricane Barry scene
Storm clouds gather above New Orleans (Matthew Hinton/AP)

Downpours are also lashing coastal Alabama and Mississippi. Parts of Dauphin Island, a barrier island in Alabama 200 miles from Barry’s projected path, were flooded both by rain and surging water from the Gulf.

Barry is moving so slowly that it is likely heavy rain will continue throughout the weekend.

There are predictions of 10-20in through Sunday across a swath of Louisiana that includes New Orleans and Baton Rouge, with some parts of the state possible getting 25in.

Hurricane Barry scene
Flood waters from Lake Pontchartrain in Mandeville, Louisiana (Matthew Hinton/AP)

“Although you may not have seen rainfall as we have been discussing, it is coming our way,” she said.

Looking ahead, tracking forecasts show the storm moving towards Chicago, swelling the Mississippi River basin with water that must eventually flow south again.

Governors have declared emergencies in Louisiana and Mississippi, and authorities have taken unprecedented precautions in closing floodgates and raising the barriers around New Orleans.

Louisiana Governor John Bel Edwards said: “This is just the beginning. It’s going to be a long several days for our state.”

But he still said he does not expect the Mississippi River to spill over the levees despite water levels already running high from spring rains and melting snow upstream.

Oil and gas operators have evacuated hundreds of platforms and rigs in the Gulf of Mexico amid the storm.

The US Bureau of Safety and Environmental Enforcement says 283 of 669 manned platforms have been evacuated, while 20 movable rigs have been pulled out of Barry’s path.

The bureau estimates nearly 70% of Gulf oil production and 56% of gas production were turned off on Saturday.

Rescue crews and about 3,000 National Guard troops are posted around Louisiana with boats, high-water vehicles and helicopters.

President Donald Trump has declared a federal emergency for Louisiana, authorising federal agencies to co-ordinate relief efforts.

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