And any snow that does stick around will melt right after sunrise as temperatures climb above freezing. Most of it will be flurries, meaning it won’t stick. Rainfall totals will likely range from a few hundredths of an inch along San Francisco Bay to a couple tenths of an inch in the North Bay valleys, East Bay hills and Santa Cruz Mountains.ĭepending on the timing of the precipitation, some of it will likely fall as snow, with the highest chances for snow slated for residents living along the foothills of the region. Given that this system is coming in from the north, then it’s likely that it will hoist enough Pacific moisture into the Bay Area to raise rain showers from Tuesday night through Friday morning. But will the system hold enough moisture to reel in precipitation to the Bay Area?īoth the American and European weather models are struggling with deciding how much moisture will stream into the Bay Area between Tuesday and Friday of next week, with the American model hinting at higher totals than the European.īoth the European (left) and American (right) weather models are still struggling with honing in on exact snowfall totals for Northern California next week, with the European model trending toward isolated pockets of snow in the higher terrain of the Bay Area, while the American model takes the snowline down to the foothills of the Santa Clara Valley. So, the stage is set for unusually cold mornings next week, courtesy of Tuesday’s low-pressure system. The same goes for residents along the Marin Headlands, the Cupertino Hills and San Mateo County’s foothills, where morning lows could easily drop to 30 degrees before sunrise.įor now, the weather models are all trending in the direction of morning lows that struggle to stay above 32 degrees along portions of San Francisco Bay while inland valleys easily fall below 32 degrees over the course of those three mornings. If this plays out, then that means residents in cities like Dublin and Walnut Creek will be waking up to temperatures at freezing on Wednesday, Thursday and Friday mornings. So much cold air is slated to make it down to California that weather models have been hinting at the snowline making it down to the Oakland and Berkeley foothills. This system will hoist dark clouds, gusty northwest winds and freezing arctic air as far south as San Diego. The Climate Prediction Center is showcasing just how below-average these temperatures are across the West Coast, with most of the region slated for below-average temperatures through the end of the month, Baron Lynxīut by Tuesday, that line-of-defense will be fighting off one of the coldest low-pressure systems of the season. In the winter, this effect acts like a line-of-defense against the onslaught of cold outbreaks that impact residents farther inland. During a Friday YouTube office hours event, UCLA climate scientist Daniel Swain explained that when cold air masses move over the Pacific Ocean, they warm up due to the ocean’s temperature, depleting any chances of sea level snow by the time they hit the coast. This layer of warmer air, known as the marine layer, plays a pivotal role in weather on the coast year-round. That’s largely to do with the warm sea-surface temperatures that help regulate the air along the California coast. Long-time residents of San Francisco know that it’s extremely rare for winter storms to cause snow to fall at sea level. So, what exactly is on tap for next week, and what are the odds that some (or any) of these conditions play out? A few weather models are even pushing for the snowline – the boundary where temperatures fall below 32 degrees – to make it down to parts of the coast by Wednesday and Thursday.
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