Police have been required to drive doctors and nurses to and from hospitals, Walsh said.

Schools will be closed on Friday, and shelters are opening in case flooding continues and evacuations are necessary, Walsh said. Flooding is affecting the Seaport, Charlestown, the North End, East Boston and Dorchester, he added.

\"PHOTO:
Brian Snyder/Reuters
PHOTO: Drivers make their way along the flooded Beach Road after the ocean overtopped the seawall during a winter snowstorm in the Boston suburb of Lynn, Mass., Jan. 4, 2018.
>

In Brighton, a senior complex was evacuated due to water damage, Walsh said, adding 89 seniors were put up in hotels.

Meanwhile, firefighters were seen rescuing a driver from a car that was stranded on a flooded underpass in Boston.

\"PHOTO:
Brian Snyder/Reuters
PHOTO: Drivers make their way along the flooded Beach Road after the ocean overtopped the seawall during a winter snowstorm in the Boston suburb of Lynn, Mass., Jan. 4, 2018.
>

In Winthrop, one resident was seen kayaking through the streets.

winthrop (in) the sea :) @boston25 @OnlyInBOS #blizzard2018 pic.twitter.com/aLQZwI8Mw0

— liv (@odriscoll99) January 4, 2018

The massive storm has led U.S. airlines to cancel at least 3,731 flights within, into and out of the United States today, and delay 1,401 others, according to airline tracking firm FlightAware. Many of the cancellations were in Boston.

Eastern Massachusetts, including the Greater Boston area, is expected to get buried under 12 to 18 inches of snow today, according to the National Weather Service.

In Nantucket, a peak wind of 76 mph was reported.

\"PHOTO:
Michael Dwyer/AP
PHOTO: A firefighter wades through flood waters from Boston Harbor on Long Wharf in Boston, Jan. 4, 2018.
>

Snowfall in Boston should let up this evening, meteorologists said.

ABC News' Morgan Winsor contributed to this report.

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