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Maps: Here’s where the heaviest rain is expected to fall as Ida moves through

Vehicles had to navigate some standing water on Ayer Road as a heavy rain cell went though Harvard on Aug 23.
Vehicles had to navigate some standing water on Ayer Road as a heavy rain cell went though Harvard on Aug 23.Jim Davis/Globe Staff

Flash flood warnings are in effect in parts of Massachusetts as the remnants of Hurricane Ida move through Southern New England. A tornado watch was in effect for the Cape and Islands through 7 a.m. Thursday, forecasters said.

Flash flood warnings continued for communities in Cape Cod, Worcester, Milford, Springfield, Lowell, and Haverhill until 8:30 a.m. Around Boston, flash flooding warnings will be in effect until 9 a.m., forecasters said.

Flash floods occur within a few minutes or hours of excessive rainfall and their force can move cars, tear out trees, and destroy buildings and bridges. As of midnight, forecasters said around 1 inch of rain had fallen in the Boston area.

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Flash flood warnings issued for most of the state.
Flash flood warnings issued for most of the state.NWS

Forecasters say 4 to 6 inches of rain is expected to hit Connecticut, Rhode Island, and portions of central Massachusetts, as the already rain-soaked region braces for another round of heavy precipitation.

A look at the forecast as of Wednesday afternoon.
A look at the forecast as of Wednesday afternoon.National Weather Service

The heaviest rain is forecast to fall across Connecticut, Southeastern Massachusetts, and Rhode Island.

The remnants of Ida were expected to bring up to 6 inches of rain to Boston Wednesday night into Thursday morning. The majority of the Cape is forecasted to receive less rain, with 3 to 4 inches possible.

The flash flood watch took effect at 2 p.m. Wednesday and will extend until 2 p.m. on Thursday, according to the weather service.

There is potential for rare/high Impact flooding in some areas.
There is potential for rare/high Impact flooding in some areas.NOAA

Forecasters are warning of rare, high-impact flooding into Thursday morning which may flood basements and wash out roads.

“Severe, widespread flash flooding is expected with Ida. Areas that normally do not experience flash flooding will flood,” wrote the National Weather Service.

Flooding Rain Event Effects and Impact Timeline
Flooding Rain Event Effects and Impact TimelineNOAA


Some warnings on driving into deep water.
Some warnings on driving into deep water.NOAA

The National Weather Service is encouraging people to avoid driving at night when it is difficult to see flooded roads.

If you are caught driving on a flooded road and waters are rising rapidly around you, get out of the car quickly and move to higher ground. Most cars can be swept away by less than 2 feet of moving water.

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Three simple steps for flash flood safety.
Three simple steps for flash flood safety.NOAA

The state of Massachusetts recommends that during a flash flood watch, residents should keep up to date with the latest information on weather conditions, tie down outdoor objects, and be prepared to move to higher ground.


Maria Elena Little Endara can be reached at mariaelena.littleendara@globe.com. Brittany Bowker can be reached at brittany.bowker@globe.com. Follower her on Twitter @brittbowker.