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NEW YORK — Tropical Storm Isaias became Hurricane Isaias once again Monday evening, strengthening as it approached the Carolinas, and making landfall late Monday night near Ocean Isle Beach in North Carolina.

Officials in New York and New Jersey are preparing for the storm’s expected arrival on Tuesday.

New York City and most of the tri-state region are under a tropical storm warning through Wednesday morning, according to the National Weather Service. A flash flood watch was also issued from 6 a.m. Tuesday to 6 a.m. Wednesday.

Prior to Isaias’ arrival, a Severe Thunderstorm Warning was issued for Queens, Brooklyn, Nassau County and parts of Suffolk County, expiring at 9:45 p.m. Monday. Fairfield, New Haven and parts of Middlesex counties were under a Severe Thunderstorm Warning until 10:45 p.m., as well as parts of Westchester and Putnam counties.

“We expect impacts (heavy rain, wind, dangerous seas) to begin Tuesday into Wednesday,” the National Weather Service said.

New York City’s Office of Emergency Management issued a coastal flood watch for parts of Brooklyn, Queens and Staten Island, from 8 p.m. Tuesday through 2 a.m. Wednesday.

Isaias weakened from a hurricane to a tropical storm Saturday, but strengthened as expected Monday and will likely bring heavy rain and flooding to areas along the East Coast this week. The threat of tornadoes is also possible.

Bands of heavy rain from the tropical storm lashed Florida’s east coast Sunday.

Officials in Myrtle Beach ordered swimmers out of the water Monday and downtown Charleston braced for potential flooding.

In North Carolina, officials were wrapping up evacuations of Ocracoke Island, which took a beating last year from Hurricane Dorian.

Isaias: NJ preparing for possible flooding

Impact on New York, New Jersey

The National Hurricane Center expects Isaias to arrive in the tri-state area Tuesday.

Heavy rain and gusty winds will begin Tuesday morning and increase by the afternoon and into the evening.

Rainfall of between 2 and 4 inches, with locally higher amounts possible, is predicted for New York City, coastal New Jersey, Long Island and Connecticut. Over western New Jersey and the interior Hudson Valley, 4 to 6 inches of rain are possible.

Coastal flooding will be possible during times of high tide Tuesday, before the system moves out of the area overnight into Wednesday.

Winds of 35 to 40 mph, with higher gusts near 50 to 60 mph, could cause damage to structures, bring down tress and power lines and cause outages.

Gov. Phil Murphy reminded New Jersey residents to avoid unnecessary travel and report power outages.

“There is the possibility for some trees to come down and power outages. If you experience a power outage, please call it in immediately to your electric utility,” Murphy said during a coronavirus briefing Monday. “Do not attempt to drive into any flood waters.”

New York officials are also bracing for the storm.

New York City Office of Emergency Management has activated its flash flood plan. Crews have been clearing streets and catch basins in flood-prone areas of the five boroughs since Saturday.

The OEM’s downed tree task force has been put on alert and crews have installed flood barriers along a one-mile stretch of lower Manhattan, where a storm surge of about 1 to 2 feet is possible, according to OEM Commissioner Deanne Criswell.

Click here for tips on how New Yorkers can prepare for Isaias

Officials with Con Edison, meanwhile, are urging customers to register on the utility’s website to make reporting power outages easier. Customers can sign up to receive power outage alerts and updates on their phones.

Generators, pumps, large-scale vehicles and other storm-related equipment are being moved downstate ahead of the storm’s projected arrival, Gov. Andrew Cuomo said.

The MTA is also warning New Yorkers to avoid unnecessary travel on Tuesday. Commuters may experience significant delays or disruptions in service on Tuesday and should plan extra travel time.

The Metro-North Railroad will run on a weekend schedule Tuesday.

The authority also banned empty tractor-trailers and tandem trucks from MTA bridges due to the predictaed strong winds.