The video in the player above is not related to the current story. The ABC7 Bay Area 24/7 streaming channel allows you to see news throughout the day.
WATCH: Latest AccuWeather forecast
AccuWeather Forecast: Storm upgraded to Level 4 system
Saturday will be a Level 1 Storm with spotty showers before heavy rain and wind make their way in the evening.
On Sunday, it will now be a Level 4, upgraded from a Level 3, on the Storm Impact Scale.
The storm is growing in intensity. We could see higher rain totals. Winds are also expected to be stronger -- there's a chance of gusts of 60-70 mph at the surface and 80 mph in the hills/mountains. Light rain begins this evening in the South Bay and moves northward. The heaviest rains are expected between midnight and 4 a.m. and will overspread the area.
LIVE RADAR: Track storms as they move through the Bay Area with Live Doppler 7
Sunday's atmospheric river:
- Rainfall totals will actually be highest on the Peninsula/Santa Cruz Mountains, closest to the axis of heaviest rain in Central CA.
- The Santa Cruz Mountains will take the brunt of this storm with 60 mph wind gusts, up to 8" of rain.
- I would expect the worst storm damage to be along the Peninsula Coast/Santa Cruz Mountains
- 1"-3" of rain for most cities, but not out of the question to see some cities approach 4" Sunday
- Flood Watches are posted for the entire Bay Area. Flooded roads, streams, creeks, landslides are all possible Sunday morning.
- High winds will also be a problem. Gusts 50-60 mph which would bring trees down, power outages.
- Heavy snow in the Sierra Sunday into Monday with 2-4 feet of new snow
Watch the latest AccuWeather forecast and take a look at recent weather stories and videos.
Bay City News contributed to this report.