Late night weather update:

With blizzard-like conditions in the Sierra, KTVU provides the latest weather update on the white-out conditions and the forecast in the Bay Area.

Historic snow event in the Sierra

10" to 20" of snowfall is already on the ground in the Sierra with more on the way. The blizzard warning for the Sierra goes into Sunday morning. There is also an avalanche warning for Saturday morning.

Heavy rain, cold, windy

Steve Paulson says Friday and Saturday will see heavy rain, cold temps and high wind gusts.

Sierra blizzard: what you need to know

A cold storm from the Gulf of Alaska has led authorities to issue a blizzard warning covering much of the Sierra Nevada mountains in California. Up to 12 feet of snow could fall in the hardest hit areas.

Light drizzle

There's some light drizzle around the Bay Area.