Barely a week past summer, some Sierra Nevada peaks have received a dusting of snow — and a bigger accumulation is possible this weekend. The unsettled weather and brisker-than-normal temperatures that have lingered in the Bay Area this week brought hail and snow to the higher elevations of the Lake Tahoe area. The National Weather Service’s Reno office said that another wave of precipitation Friday night and Saturday could see an accumulation of 1 to 2 inches of snow at the higher passes, such as Tioga and Sonora. The greatest chance of snow showers at Yosemite’s Tuolumne Meadows is after 11 p.m. Saturday, the weather service said.