A sudden swirl of winds that reached velocities of 53 miles an hour in the Washington area yesterday evening felled scores of trees and caused intermittent interruptions in power service.

The National Weather Service said the northwesternly winds would continue through today, but at a reduced velocity of 25 to 35 miles an hour.

The storm, caused by two low-pressure centers one moving up the East Coast and the second from the Ohio Valley, left .8 of an inch of rain at National Airport and about 2 inches in the Chesapeake Bay area, a weather service spokesman said.

The same storm caused snow over most of New England and New York State, and parts of western Maryland, western Pennsylvania and western Virginia, he said.

Weather conditions at New York airports caused some flights scheduled to land there to be diverted to Baltimore-Washington International and Dulles International airports, according to airport spokesmen. At least one flight into National Airport was diverted to Dulles, they said.

The weather service issued gale warnings for the Chesapeake Bay area.

Virginia Electric and Power Co. reported a circuit out in Annandale near Northern Virginia Community College affecting 883 households, a spokesman said.

Potomac Electric Power Co. said "wires were down everywhere." And a Fairfax County Fire Department spokesman said the department had received reports of fallen trees in Great Falls, McLean, Annandale and Reston.