A winter storm warning for the Sierra remained in effect until 6 p.m. Sierra ski resorts received significant snowfall, with Kirkwood reporting 46 inches over the 24 hours ending Monday morning, Northstar 29 inches and Squaw Valley-Alpine Meadows 28 inches. The rain caused slick roadways across the Bay Area on Monday, with further delays at San Francisco International Airport and some minor power outages, but no significant flooding or other disruptions. Those totals are expected to bring the rainfall totals for most Bay Area cities to roughly 50 to 60 percent of the historical average. NWS California-Nevada RFC December 2, 2019 More precip is expected at times into next weekend, see the latest river fcst and QPF at ! #cawx #nvwx /elH5imhtfq The wet season arrived with a wet Thanksgiving week for CA! 5-10 inches fell in the Sierra and the Santa Cruz and Santa Lucia Mtns. It should deliver 3 to 5 inches in the coastal mountains, Mehle said, and 1 to 2 inches in Bay Area cities. And a new storm is forecast to roll in from the north on Friday, bringing with it a new round of moisture into Saturday. Intermittent showers are expected to continue Tuesday and Wednesday across the Bay Area. This graphic shows a perfect example of the rain shadow that occurred with the recent storm. Rain shadow? What is it? An area of reduced precipitation on the lee side of a mountain barrier caused by warming of air and dissipation of cloudiness as air descends the barrier. Los Angeles, which a week ago faced severe fire danger, was at 121% of its historical average on Monday, and San Diego was at 168%. 1, Oakland reached 32%, San Francisco 35%, San Jose 38%, Sacramento 42% and Santa Rosa 60%.įarther south, the totals are even more impressive. (Dan Coyro - Santa Cruz Sentinel)Ī week ago, most Bay Area cities were below 10% of their historical rainfall totals for late November. Cabrillo College students hustle to class during a Monday afternoon downpour. They also ended tinder-dry months of fire danger that led PG&E to shut off power to hundreds of thousands of homes and businesses during red-flag warnings to prevent its equipment from sparking more deadly wildfires. Nevertheless, the storms are making a dent in the huge rainfall deficit that Northern California was facing this autumn, leading to fears that the region might be heading into a new drought. The six-day rain totals from last Tuesday through 1 p.m. “In this case, it just came in and sat south of San Francisco over the Santa Cruz Mountains and Big Sur.” “Usually we see a little more wavering in that fire hose during atmospheric river storms,” he added. They didn’t get the higher moisture content that the other places got. “But for San Francisco and Oakland, that was just luck. “The Santa Clara and Salinas valleys were examples of rain shadowing,” Mehle said. Some of the difference is due to the rain shadow effect, meteorologists said Monday, where storms dump their moisture on the ocean side of the mountains and the inland side receives very little.Īnd some is just random chance: The atmospheric river storm that soaked the coast over the weekend into Monday made a direct hit in the Santa Cruz Mountains and Big Sur, largely missing the Bay Area’s big cities. “We’re asking people to drive carefully and to slow down.”īut most Bay Area cities have received only a fraction of those rain totals - 1 to 2 inches since last Tuesday. It’s been pouring,” said Mark Bingham, chief of the Boulder Creek Fire Protection District. Motorists venture into the flooded streets of Rio Del Mar flats during a downpour on Monday afternoon. Through mid-day Monday, coastal areas, including Big Sur and the Sonoma hills, have seen a staggering 12 inches or more of rain since last Tuesday night, while communities across the Santa Cruz Mountains have received 6 to 9 inches.
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