The National Weather Service (NWS) has issued a Flood Watch for Fairfield and New Haven counties, with a major nor’easter expected to bring heavy rain to the region through Tuesday.

The Flood Watch is in effect for Tuesday morning through late Tuesday night, and covers much of the tri-state region. In addition, a Coastal Flood Watch has been issued for towns along Long Island Sound for the same time period.

“Rain will be heavy at times with two to three inches possible by the time the event ends Tuesday night, with localized higher amounts,” the weather service said.

The slow-moving storm is moving up the Eastern seaboard and will arrive late Monday night, and it should rain all day on Tuesday throughout the region.

Temperatures to rise

The storm also will bring warmer temperatures.

The storm also will produce strong winds, with wind gusts close to 40 mph possible on Tuesday, according to the weather service.

Rain also is likely on Wednesday, and there is a possibility of some snow on Thursday and a wintry mix Wednesday night. Temperatures will remain in the 30s and low 40s during the coming days, the NWS said.