Winds peaked at 70 miles per hour at 2:17 a.m. on Mt. Diablo in Contra Costa County, Weather Service forecaster Bob Benjamin said. Winds of 40 to 50 miles per hour were recorded in the Oakland hills. Winds peaked at 35 miles per hour at 1:54 a.m. in Hayward. Angel Island recorded 46 miles per hour.
Winds are steadily dropping, Benjamin said. At 10 a.m. winds in the Oakland hills were peaking at 27 miles per hour, he said.
The forecast is for moderate winds, still a breezy day, a high wind advisory expired at 9 a.m., Benjamin said.
The Bay Area's big winds were caused by a pressure variance: High barometric pressure inland, low pressure out in the Pacific, caused wind to blow from the high northeast toward the low at sea, he said.
Temperatures are expected to remain chilly today with highs around 60.