Live updates: Isaias weakens to post-tropical cyclone after killing at least 6 people and leaving more than 3.7 million without power

Isaias spawned deadly tornadoes and dumped heavy rain as it roared up the East Coast on Tuesday after making landfall as a hurricane Monday night before weakening to a post-tropical cyclone.

At least six people have died due to the storm and more than 3 million customers across five states were without power late Tuesday night.

A tornado killed two people and injured several others at a mobile home park in Bertie County, North Carolina, Gov. Roy Cooper said. Authorities also said three others were killed by falling trees toppled by the storm in Maryland, New York City and Delaware. Another died when her vehicle was overtaken by Pennsylvania floods and swept downstream.

Other tornadoes were reported in Virginia, Maryland, Delaware and New Jersey, the National Weather Service's Storm Prediction Center said. Even without tornadoes, winds could cause significant tree damage and power outages, the National Hurricane Center said.

What was once Hurricane Isaias was downgraded late Tuesday night to a post-tropical storm, defined by the NHC as "a cyclone that no longer possesses sufficient tropical characteristics" to be defined as a tropical storm. The post-tropical cyclone is forecast to dissipate over southeastern Canada on Wednesday night or Thursday.

Tropical storm warnings are still in place from Massachusetts to Maine, as the storm sustains max winds of near 45 mph. The NHC said in its 11 p.m. EDT advisory that "a couple of tornadoes are possible across central and eastern Maine."

More than 3.7 million customers were without power, mostly in New Jersey, New York and Connecticut, according to New York City’s power utility said it has seen more outages from this storm than from any storm except Superstorm Sandy in 2012.

Here's what you need to know:

  • As of 11 p.m. EDT, the storm’s center was about 45 miles southeast of Montreal, moving northeast into Canada.

  • Scattered moderate and major river flooding is forecast across portions of the Mid-Atlantic.

  • What's it like out there? These live webcams show beaches in Maryland, Virginia and Delaware. 🌊

  • The next advisory from the National Hurricane Center will be released at 2 a.m. EDT wednesday.

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New Jersey: 1.4 million without power; tropical storm warning in effect

Heavy rains were falling Tuesday across New Jersey as Tropical Storm Isaias roared to the north, leaving behind power outages and reports of tornadoes. Almost 1.4 million customers were without power, said, by far the highest total of any state.

The storm was disrupting ground travel across the state at midday. New Jersey Transit’s River Line and Atlantic City rail service was suspended or delayed in some areas due to downed trees and flooding, and trees blocked lanes on the Garden State Parkway in Upper Township and the New Jersey Turnpike in Edison.

Gov. Phil Murphy declared a state of emergency.

Heavy rainfall up to 6 inches was forecast to impact the state. A tornado watch was also issued Tuesday, which lasted through 4 p.m.

– Nicholas Katzban, Bergen Record; Joshua Chung and Keith Schubert, Asbury Park Press

Flooding, water rescues in Philadelphia

There were numerous reports of flooding in Philadelphia and its surroundings. The Schuylkill River was projected to crest early Wednesday at 15.4 feet, its highest level in more than 150 years. The river had already surged over its banks in some areas by Tuesday night.

In Montgomery County to the northwest of Philadelphia, officials said they performed more than 100 water rescues.

In northwest of the city, a 44-year-old Allentown woman was killed after high waters swept her vehicle downstream, the Lehigh County coroner’s office said.

West of Philadelphia in Delaware County, rescue workers were searching for a young person who fell or jumped into the fast-moving water of a swollen creek.

And in Doylestown to the north, officials said four children were treated for minor injuries after high winds partially tore the roof off a day care center. About 135 children and their teachers had to be ushered out.

Airlines issue flight waivers

Traveling? If it's by plane, odds are good your airline is issuing flight waivers. United, American, Southwest, JetBlue and Delta have issued them in the wake of Tropical Storm Isaias.

A flight waiver gives travelers the option to rebook flights at no extra charge. There are typically terms and conditions, however, that prevent customers from buying flights outside of certain dates and from changing cabins unless they want to pay a fee. Travelers are urged to read airlines' fine print before rebooking.

– David Oliver

Isaias was a hurricane: Why do tropical weather systems cause tornadoes?

At least 2 tornadoes confirmed on Maryland Eastern Shore

At least two radar-confirmed tornadoes were reported on Maryland's Eastern Shore, according to the National Weather Service.

The first was located at 6:01 a.m. near Vienna moving north near Sharptown, Hurlock and Choptank. Social media reports indicate the tornado littered Route 50 with debris and caused damage in Mardela Springs, with photos posted to Facebook showing at least one home destroyed.

A second tornado was located on radar at 7:20 a.m. just north of Girdletree heading toward Snow Hill.

Chesapeake Bay: What to expect if Isaias continues track over it

– Brandon Holveck, Delaware News Journal

D.C., Baltimore could see flooding

Heavy rainfall along the East Coast will result in flash and urban flooding, some of which may be significant in North Carolina through the Mid-Atlantic and Northeast through tonight, the hurricane center said. Central and eastern North Carolina are expected to see the heaviest rainfall of 3 to 6 inches, with some areas seeing up to 8 inches. Potentially life-threatening urban flooding is possible in Washington, D.C., Baltimore, and other areas along the I-95 corridor.

Contributing: Elinor Aspegren and Jordan Culver, USA TODAY; The Associated Press

This article originally appeared on USA TODAY: Isaias track, forecast, updates: Storm leaves power outages, tornadoes