Mount Shasta was already reporting more than a foot of snow Monday morning. “Heavy snow is likely across much of the terrain, accumulating to 6 feet or more in parts of the Sierra Nevada. “Heavy mountain snow and lowland rain will overspread California and the Great Basin today and Tuesday,” the WPC tweeted. The last time the office recorded a storm total over an inch was in January. This storm could end up dropping 2 to 3 inches of rain downtown, the most rainfall the city has seen for about a year. “All systems go for a strong and impactful storm to move into southwest California later tonight and hang around through Tuesday,” said the weather office in Los Angeles, adding it expects 2 to 3 times more rainfall than an October storm that struck the region. The system will continue its move down the coast Monday night. “Isolated amounts of 10-12 inches are possible for the higher peaks,” the San Francisco office said.Ī Level 3 of 4 threat for extreme rainfall is in place for this region Monday. It appears the steadiest and highest rainfall rates will be concentrated along the Big Sur coast through the afternoon and evening hours, according to the National Weather Service office in San Francisco. “Models indicate that an atmospheric river event will intensify through the early morning hours, resulting in heavy rainfall,” the Weather Predictions Center said.

California rain