The odds are increasing that the D.C. region will see significant flooding due to Tropical Storm Isaias late Monday into Tuesday, according to the National Weather Service.

National Weather Service

This story was updated at 11:25 a.m. on Aug. 3.

The D.C. region is expected to see significant flooding and high winds due to Tropical Storm Isaias late Monday into Tuesday, according to the National Weather Service. The NWS has issued a tropical storm warning for the District and surround areas, up and down the East Coast.

Widespread rainfall could drop three to six inches of rain, with higher amounts possible, which could cause “significant flash flooding of small streams and creeks Monday night into Tuesday evening,” according to a NWS advisory from Monday morning.

Residents should prepare for “life-threatening rainfall flooding,” the NWS says. The Weather Service upgraded a storm watch for the region to a storm warning late Monday morning, meaning tropical storm conditions are not just possible, but expected.

In addition to flooding, the NWS also warns there could be minor wind damage in the D.C. area, as well as scattered power outages. Wind gusts are forecast to be 45 mph, with winds as high as 57 mph possible.

A coastal flood watch is also in effect from Tuesday morning through the evening with flooding likely during high tide.

D.C. Homeland Security and Emergency Management is also warning residents about the potential of high winds, dangerous conditions, and possible power outages. The agency advised residents to prepare by bringing objects inside that could go airborne, and secure loose objects that can’t be brought inside.

On Saturday, Hurricane Isaias hit the Bahamas though initial estimates are that it could have been a lot worse. It moved through the Caribbean on Sunday, scraping the Dominican Republic and Puerto Rico, before being downgraded to a Tropical Storm.

As of Monday morning, the storm was 660 miles south of Washington, off Florida’s northeastern coast with wind speeds of 70 mph. It’s expected regain hurricane strength before making landfall in the Carolinas, according to the NWS.

The reason reason for high expected rainfall in the D.C region is not solely due to the storm. There’s a low-pressure storm mass moving east from Ohio as well as a mass of hot, humid air coming in from the mid-Atlantic. Mixing all three of these together, which is expected to happen late Monday, could result in a prolonged period of rain.

This story was updated to include the latest weather information.

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