Monday, August 3, 2020

Tropical Storm Isaias to Spread Heavy Rain and Strong Winds Into Mid-Atlantic and Northeast

Linda Lam
Published: August 3,2020









Linda Lam
Published: August 3, 2020

Tropical Storm Isaias will track up the East Coast through Tuesday night, where it could produce flooding rainfall and strong winds.

Isaias will move into the Carolinas Monday night into early Tuesday. From there, it will accelerate through the mid-Atlantic and Northeast ahead of a southward plunge of the jet stream moving into the eastern states.

Projected Path

Timing

Monday-Monday Night

Isaias will move toward the coastal Carolinas on Monday and Monday night.

Strong, gusty winds will reach into portions of the eastern Carolinas, along with heavy rain. There is also the potential for thunderstorms and an isolated tornado.

Scattered areas of heavy rain could also impact the mid-Atlantic and other parts of the Southeast. That's due to tropical moisture streaming northward ahead of the southward plunging jet stream in the East.

Current Radar, Satellite and Winds

Tuesday-Tuesday Night

Rain and wind will spread northward through mid-Atlantic and Northeast Tuesday and Tuesday night.

Flash flooding is possible in some areas, particularly from eastern Virginia to New England.

Wind gusts greater than 40 mph are most likely in coastal areas, particularly along and to the east of the track of the center of Isaias from the Virginia Tidewater and Delmarva Peninsula to Long Island and southern New England.

In these areas, at least scattered power outages and downed trees are possible as Isaias sweeps through.

Some strong wind gusts may linger in parts of Maine early Wednesday before Isaias or its remnant departs into eastern Canada.

Wind Gust Forecast and Timing

Rainfall Flooding Potential

Isaias has the potential to produce the following rainfall totals along its path early this week, according to the National Hurricane Center.

-Carolinas and mid-Atlantic: 3 to 6 inches, with isolated maximum totals of 8 inches

-Southeast New York and much of New England: 2 to 4 inches, with isolated maximum totals of 6 inches.

The heavy rainfall could trigger flash flooding in some of these areas. Minor to isolated moderate river flooding is also possible in parts of the eastern states.

Some rainfall is good news as just under 30% of the Northeast is in drought, with 70% of the region at least abnormally dry, according to the U.S. Drought Monitor. Heavier rainfall over a relatively short period of time could be too much of a good thing.

Rainfall Forecast

Flood watches have been issued by the National Weather Service from the Carolinas to the Northeast, including Washington D.C., Baltimore, Philadelphia and parts of the New York City Tri-State area.

Flood Alerts

The Weather Company’s primary journalistic mission is to report on breaking weather news, the environment and the importance of science to our lives. This story does not necessarily represent the position of our parent company, IBM.

The Weather Company’s primary journalistic mission is to report on breaking weather news, the environment and the importance of science to our lives. This story does not necessarily represent the position of our parent company, IBM.


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