Rain dampened President Donald Trump's parade to celebrate the U.S. Army's 250th birthday with thousands of troops, 150 vehicles and 50 aircraft in a parade, concert and fireworks.

Sam Burns and Adam Scott started the last round of the U.S. Open in the final group, one shot separating them in first and second place.

As Washington, D.C., prepares to host a parade celebrating the U.S. Army’s 250th birthday on Saturday, weather forecasters are warning of the potential for showers and thunderstorms that could disrupt the day’s events, including a scheduled appearance by President Trump, whose 79th birthday coincides with the celebration.

There's a 50 percent chance of storms from 3 p.m. to 6 p.m. ET on Sunday, according to WTAE in Pittsburgh, and radar predictions indicate that the heaviest rain will fall around 4 p.m. The showers will likely be spotty, though, with intermittent sunshine between.

President Trump assured the nation on Saturday morning that the military parade will go on rain or shine. "A rainy day parade brings good luck," Trump wrote on Truth Social. Forecasters said Washingto

Trump’s parade, planned to coincide with his birthday but ostensibly designed to celebrate the 250th anniversary of the United States Army, has drawn significant criticism because of the massive cost to taxpayers, and concern from D.C. officials over the potential damage the tanks might do to city streets.

Picture the scene, just after 4 p.m. Eastern, after the horn blew in the final round of the U.S. Open. Play suspended. Scotland's Robert MacIntyre, alone in the locker room, with an air conditioner unit pointing at his wet shirt,

Light rain was falling in Washington by 6:30 p.m., with a light breeze cutting through some of the humidity of the day. Some spectators held up umbrellas. There was no sign of lightning, which could prompt delays for safety reasons.