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.

Play has been suspended in the final round of the U.S. Open due to heavy rain falling at Oakmont Country Club. The horn sounded at 4:01 p.m. ET Sunday — the signal for players to get off the golf course as torrential downpour ensued. The leaders have played seven holes.