What was at first forecast as possible snow has switched to intense rainfall for much of Massachusetts, where a large portion of the state is predicted to receive more than an inch of rain Sunday night into Monday morning.

“Low pressure will rapidly intensify, bringing winds of up to 50 mph to the Cape and Islands and up to 2″ of rain in a three to six hour period to Rhode Island and Eastern Massachusetts,” the National Weather Service reported on X, formerly known as Twitter, on Sunday morning.

In addition to the heavy rains, some minor coastal flooding may be possible in certain parts of Rhode Island and Eastern Massachusetts.

An area of the coast from Westerly, Rhode Island, to New Bedford, Massachusetts — including Providence — is slated for up to a foot of coastal flooding, the Weather Service predicts.

A wind advisory is in effect from 1 a.m. to 7 a.m. on Monday for the Cape and Islands, with wind gusts up to 55 mph and expected downed tree branches and isolated power outages.

Across Massachusetts, significant rainfall is expected. Almost all of the state east of Worcester and the entirety of Rhode Island is expected to get more than an inch of rainfall — between an inch and an inch and a half — with the western half of the state predicted to receive between a half inch and an inch.

The storm comes on the 125th anniversary of the famous Portland Gale, which on Nov. 26-27 in 1898 brought hurricane force winds to Nantucket, a 10-foot storm surge in Cohasset harbor and heavy snow tih more than a foot across Southern New England. During the storm, more than 140 ships were wrecked and more than 400 lives were lost.

The upcoming storm is likely to be centered on the Interstate-95 corridor. Minor urban street flooding, especially in areas with poor drainage, is expected in that area, the Weather Service predicts.

Later in the week, the National Weather Service predicts below-average temperatures on Tuesday and Wednesday, with a return to normal on Thursday and Friday.