SAN FRANCISCO (CBS SF) — A downed tree was blocking a busy street in San Francisco Thursday during a wind advisory that was issued for the Bay Area and Monterey through Friday morning, according to the National Weather Service.

The advisory went into effect at 7 a.m. Thursday and ends at 4 a.m. Friday for elevations above 1,000 feet in the Bay Area hills and mountains, as well as the mountains in Monterey County.

North winds of 20 to 30 mph are expected, with gusts of up to 45 mph and localized gusts of up to 55 mph.

Weather officials said the wind will move unsecured objects and may knock down trees or tree limbs and knock out power.

San Francisco Fire reported a tree down on the 300 block of Hayes Street at about 9:40 a.m. Thursday morning. The tree was still blocking both lanes of the street and had fallen between the cab and the trailer of a delivery truck.

The wind will also make driving difficult, especially for people driving taller vehicles and those pulling trailers.