Coastal Flood Warning In Effect Late Monday

Some moderate flooding is anticipated late Monday into early Tuesday, according to the National Weather Service, which has initiated a coastal flood warning for most of the Massachusetts coastline.

The warning follows an earlier coastal flood advisory, which was in effect from 10 a.m. until 2 p.m. Monday afternoon.

"Minor coastal flooding is expected during the midday high tide," said the weather service, "but more significant moderate flooding is anticipated during [Monday evening's] high tide cycle, particularly along north- and east-facing coastlines south of Boston."

The weather service said high astronomical tides, strong winds and a large storm surge are causing the flood warnings.

"We're combining [the tide] with a fairly strong June gale storm that's deepening offshore," NWS meteorologist Matt Doodie told our Newscast unit, "and that's creating some very strong north-to-northeast winds."

According to the Boston Globe:

Coastal flood warnings are issued when forecasters believe numerous road closures may be needed and people could risk their lives if they get too near to the pounding surf. Some homes may even be damaged, the service warned.

Early Monday, National Grid shut off power to about 20 homes in Quincy as a result of flooding overnight. Flooding was also reported in Scituate Monday morning.

While rough seas were not specifically cited as a suspected cause, an unmanned 37-foot sailboat broke free of its mooring Monday and ran aground at Logan Airport, reportedly causing some flight delays before it was removed.