Storm system brings rain, moderate to heavy mountain snow, cooler temperatures, breezy winds, and potential for strong to severe thunderstorms Monday through Wednesday.

Storm timeline April 20 through 23

Scattered showers are beginning to spread toward interior NorCal, with a gradual shift toward more widespread coverage through this afternoon and evening.

Periods of moderate rain/mountain snow are expected from this evening through Wednesday, with some heavy rain/mountain snow potential at times on Tuesday.

Moderate chance of excessive rainfall

Heaviest precipitation on Tuesday, especially during the morning commute. Rain Forecast: Today – Wed. Moderate Impacts. Slick roads and thunderstorm chances. Snow levels 6000 to 7000 ft Monday, lowering to around 5000-6000 ft Tuesday, then 4500-5500 ft by Wednesday morning.

Rain Forecast: Today - Wed. Moderate Impacts. Slick roads and thunderstorm chances. Snow levels 6000 to 7000 ft Monday, lowering to around 5000-6000 ft Tuesday, then 4500-5500 ft by Wednesday morning.

Snow levels 6000 to 7000 ft Monday, lowering to around 5000-6000 ft Tuesday, then 4500-5500 ft by Wednesday morning.

Snow Forecast: Tuesday - Wednesday. Moderate Impacts. Travel delays and slick roads. Chain controls. Reductions in visibilities at times. Snow levels 6000 to 7000 ft Today, lowering to around 5000 to 6000 ft Tuesday, then 4500 to 5500 feet by Wednesday morning.

Snow Forecast: Tuesday – Wednesday. Moderate Impacts. Travel delays and slick roads. Chain controls. Reductions in visibilities at times. Snow levels 6000 to 7000 ft Today, lowering to around 5000 to 6000 ft Tuesday, then 4500 to 5500 feet by Wednesday morning.

A Winter Storm Warning has been issued from 2 am Tuesday to 5 pm Wednesday.

A trend toward dry/seasonable weather for the Valley/foothills is anticipated from Thursday onward, although some potential for showers/isolated thunderstorms exist along the Sierra.