Tropical Storm Isaias was set to regain hurricane strength Monday before slamming into the US eastern seaboard, bringing life-threatening storm surges to North and South Carolina.

The storm, currently 60 miles (100 kilometers) southeast of Charleston, South Carolina, was packing sustained winds of 70 miles (100 kilometers) per hour, with wind speeds predicted to increase during the day.

Locals try to save their belongings
Locals try to rescue their belonging after the overflow of the Magua river caused by heavy rains caused during Isaias storm in the city of Hato Mayor, northwest of Santo Domingo, Dominican Republic, on July 31, 2020. Photo: AFP/Erika SANTELICES

Isaias is forecast to "make landfall tonight as a hurricane with dangerous winds and storm surge," the National Hurricane Center said, adding the storm would likely hit close to the border between North and South Carolina.

Storm surges could generate water three to five feet (one to 1.5 meters) above ground level.

The storm will then track up the East Coast, with heavy rainfall expected to cause flash flooding through the mid-Atlantic states and bringing storm-force winds to Washington, Philadelphia and New York on Tuesday.

Tropical Storm Isaias
Forecast path of tropical storm Isaias. Photo: AFP / Nicolas RAMALLO

Residents in flood-prone areas "should take all necessary actions to protect life and property from rising water and the potential for other dangerous conditions," the National Hurricane Center said.

In the hurricane warning zone, "preparations to protect life and property should be rushed to completion," it added.

Tropical storm Isaias
Hurricane Isaias unleashes flooding, topples trees and knocks out power for thousands of people in Puerto Rico. Photo: CRISTINA ARRIETA / ESN

President Donald Trump announced he had issued emergency declarations for Florida and both Carolinas, to free up federal funds.

"Everyone needs to remain vigilant," he warned during a news conference.

"I encourage everyone to follow the guidelines of the state and local authorities," he said, adding the guidelines have been "very accurate so far."

A man walks in pouring rain
A man walks under pouring rain during Isaias storm in Santo Domingo, on July 30, 2020. Photo: AFP/Erika SANTELICES

"So stay safe," he added.

workers set up temporary dams in Manhattan
Workers set up temporary plastic flood barriers and sandbags known as 'Tiger Dams' in lower Manhattan to protect the area from flooding as tropical storm Isaias approaches New York City on August 3, 2020. Photo: AFP / Angela Weiss

The Carolinas have seen a recent surge in coronavirus cases as the US struggles to curb the spread of the potentially fatal illness.

"We in North Carolina mostly know what to do," the state's governor, Roy Cooper, said Sunday.

"You pack your emergency kit, follow local evacuation orders, stay in a safe place and never drive through flooded roadways.

"But this time, pack your masks and hand sanitizers in your kit and remember to social distance."

Up to 150 National Guard soldiers have been activated to help prepare for the storm and assist in the aftermath if necessary, Cooper said.

Isaias was earlier downgraded from a Category 1 hurricane after brushing past Florida, leaving it relatively unscathed.

Some coronavirus testing centers -- many housed in tents -- were closed last week in the Sunshine State as the storm approached.

They have now begun to reopen gradually, according to local media.

Florida has emerged as an epicenter of the US virus crisis, which has already claimed nearly 155,000 lives nationwide.

On Sunday, the state reported 77 COVID-19 deaths, down from a record 179 the day before, bringing its death total to 6,920.

The storm earlier dumped torrential rain on the Bahamas, felling trees and flooding streets, before emergency management officials on Sunday gave the "all clear" for the country.

At least one person died in Puerto Rico and the storm also lashed Haiti and the Dominican Republic.

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