The Santa Cruz Mountains are likely to be in the bull’s-eye for most of Tuesday’s showers, with totals exceeding an inch across the summits near Ben Lomond.Īt this point, the rain outlook doesn’t indicate heavy downpours in May. Up to a third of an inch of rain is expected across most of the Bay Area while a half an inch to an inch is forecast in the hillsides. The earliest showers will arrive Monday night, with the bulk on Tuesday. The first week of May is set to see rounds of showers across parts of Northern California, including the Bay Area and Santa Cruz Mountains. Baron/LynxĪccording to the Climate Prediction Center, this is most likely to play out along the immediate coast, with towns and cities along Highway 1 from Mendocino to Point Conception set to have the highest chances of precipitation. The Climate Prediction Center’s outlook for the first few days of May highlights above-average chances of precipitation across Northern California, the Bay Area, Central Valley, Central Coast and the Los Angeles area. Depending on the intensity of the low-pressure systems, May’s outlook could also call for the return of drizzle and light showers over the course of the month. The signal also means that these cold snaps could stream rounds of moisture into Northern California, allowing for what’s often referred to as May Gray - the constant flow of fog that develops around this time of year - to kick off right on cue.īut fog isn’t the only type of moisture set to roll in. Weather models are signaling that troughs of low pressure are likely to form just off the coast of California over the next few weeks, meaning that there is a high chance that temperatures will run below average along the shoreline, bays and delta regions of the Bay Area. The blue-shaded area corresponds to an elevated chance of low-pressure systems, leading to higher chances of unsettled weather in the mountains and fog returning. The European weather model’s extended outlook for May showcases where anomalous areas of lower pressure are likely to develop. When these lows form off the coast, the gap they leave behind allows moisture and cold air over the Pacific Ocean to rush toward San Francisco and the wider Bay Area. These lows often develop around 5,000 feet above ground, carving out a gap in the atmosphere like a knife cutting into a slab of butter. California is poised to lock into a weather pattern chock full of troughs of low pressures.
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