Traffic on Interstate 280 along the Peninsula was brought to a standstill late Sunday night when a hail storm caused two accidents and created generally hazardous driving conditions, according to the California Highway Patrol.
The two collisions blocked the two left lanes in the southbound direction near Westborough for a brief time. The lanes were reopened at about 9:30 p.m., but CHP warned motorists to continue using caution through the area due to accumulation of hail.
Surface streets in South San Francisco such as Avalon Drive also were covered with hail and made for sloshy conditions. Some residents reported hearing thunder claps before they heard the hail begin pelting their homes and cars.