![]() The deep low pressure system driving the atmospheric river also generated historically large and powerful waves along the west coast from Washington to California. For more information on record rainfall, see the 'Heavy Rain' tab below. By day's end, October 24th, 2021 will go down as the wettest day for many cities around the Bay Area, setting records along the way. Storm reports that were submitted included flooding, downed trees, power outages, and some minor mud slides. A Flash Flood Warning was issued for the Glass Fire burn scar due to a period of intense rainfall rates. Flood Warnings and Flood Advisories were issued throughout the day from the North Bay, down the San Mateo coastline for flood risks in urban locations and small streams. At higher elevations, winds were observed between 50 to 60 mph with peak gusts between 70 to 80 mph, with gusts at KSFO measured up to 50 mph. Winds out of the southwest increased causing a Wind Advisory to be issued for the entire Bay Area. As the sun rose on the 24th, the water content increased exponentially bringing moderate to heavy rainfall around the Bay Area. ![]() Light showers already were showing up in the North Bay late on the evening of October 23rd. But as the event grew closer, it became more and more apparent that the Bay Area was to prepare for a substantial rain event.Īs the parent low pressure system moved toward Seattle and its central pressure rapidly intensified, undergoing bomb-cyclogenesis. There was reason to doubt initial model runs given that this type of an event is unusually early for the region. By the 20th, models were hinting at the chance for a high to moderate "atmospheric river", or AR, event with precipitable water values several standard deviations above the norm. However, these model runs depicted a longer stream of moisture that was tapped into the sub-tropics. As these systems moved toward the California Coastline, it brought light rain in the form of cold fronts along with atypical above average accumulations to the North Bay.īy October 18th, long-range models were indicating yet another low that would approach the Pacific Northwest bringing a chance for rain to the Bay Area. As the 2021/2022 water season began, the pattern shifted bringing a series of upper level troughs through mid-October toward the Pacific Northwest. The 2020/2021 Water year ended unceremoniously in the Summer of 2021 with a "status quo" report with little rain during the rainy season leaving dry fuels around the state keeping the region on edge during Fire Season. ![]() Overview - Atmospheric River - October 24-25, 2021Įarly Season Storm Brought Historic Heavy Rains and Strong Winds to the Bay Area
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