By L. Finch, Globe Correspondent
The heaviest showers of the nor’easter tapered off Wednesday afternoon after four days of record-breaking rain, and the slow-moving storm system should move north and out of the state by Thursday morning, forecasters said this afternoon.
Only a few lingering showers remain from a low-pressure area hovering east of Hull, according to the National Weather Service in Taunton. The unrelenting rain caused flooding on some roads this morning in various Boston-area communities, at Logan International Airport, and in the MBTA subway system.
Boston experienced just more than two inches of rain from 8 a.m. to 2.p.m. today, while Blue Hill received nearly an inch, according to the agency. Since the beginning of the storm, some areas of the state have received upwards of five or six inches of rain.
“That’s a good slug of water coming in,” meteorologist Alan Dunham said. “We’re left now just residual rain.”
Observers at the Blue Hill Observatory and Science Center said the unusual storm had unloaded 7.3 inches of rain there since Sunday, the second biggest rainstorm on record for the month of August.
And the number may yet climb. A tropical storm in 1955 dropped close to 13 inches of rain over three days.
The National Weather Service had issued a flood advisory for northeastern portions of the state until 2 p.m. today. The forecasters also warned of high surf and rip currents causing dangerous conditions for beach goers on the fourth day of a summer nor'easter.
Sunshine is expected to return Thursday as a frontal system passes across the region, bringing drier weather and highs in the mid-70s to the low 80s. The warm, sunny weather is expected to last until the middle of next week.
Globe correspondent Jeff Fish and Martin Finucane of the Globe staff contributed to this report.