New York, Boston face coastal flooding due to above-normal tides

Tides may be pulled a foot above normal in many places, sending the Atlantic onto roads and into vulnerable basements.

The New York City skyline in the background, is seen from Jersey City, N.J., Thursday, Sept. 29, 2016. The sun and the moon have aligned in just the right way to trigger coastal flooding this weekend from New Jersey to Massachusetts, including New York Harbor. (AP Photo/Seth Wenig)

(Bloomberg) – The stars — or at least the sun and the moon — have aligned in just the right way to trigger coastal flooding this weekend from New Jersey to Massachusetts, including New York Harbor.

Tides a foot above normal in many places

There are no nor’easters, hurricanes or other severe weather bearing down on the U.S. East Coast, but tides may be pulled a foot (30 centimeters) above normal in many places late Friday and early Saturday, sending the Atlantic onto roads and into vulnerable basements.

Related: Is U.S. flood risk far higher than previously believed?

The highest tides happen when the Earth, moon and sun line up and the gravitational pull on the oceans is at its peak.

Becoming more common because of warming oceans

National Weather Service advisories show that there’s no significant threat to life or property this weekend. But these extra-high tides are becoming more common, with both Boston and New York setting records in the year ended in April, according to a U.S. Center for Operational Oceanographic Products and Services report issued last week. It attributed the higher tides to rising sea levels because of melting ice and warming oceans.

Related: New York, Boston set coastal flood records as storm fuel tides