The National Weather Service said that a flood watch is in effect for most of Northern California through Wednesday morning.
Forecasters on Sunday said to expect periods of moderate to heavy rain, as well as brief heavy showers from thunderstorms, beginning later Sunday afternoon and continuing through Tuesday.
The NWS said valley and Delta areas can expect 1.5 to 3 inches of rain and foothill areas 2.5 to 5 inches of rain.
Coastal and low-lying areas should expect nuisance flooding and residents living near rivers, creeks and streams should be aware of rising water levels.
There will also be a possibility of rock and mudslides in foothill areas as periods of moderate to heavy snow will make driving to the mountains “dangerous to impossible” from Sunday through Wednesday.
The NWS says people should never drive across flooded roads and have an evacuation plan and an emergency kit as well as be prepared for delays and possible road closures.
On Monday, NWS said tornadoes, hail and thunderstorms are possible in the Central Valley and the eastern part of the East Bay Area.
“Make sure you have multiple ways of receiving weather alerts,” the NWS said on social media.