The San Francisco Bay Area Tornadoes – January 11, 1951 A rare January squall line produced damaging winds and multiple tornadoes across Northern California. While official records long listed only one tornado, Tornado Talk research confirms at least four events — including destructive F2 tornadoes in Sunnyvale and San Jose. One of the most overlooked tornado days in California history. #cawx #tornadohistory #OTD #weather #wxhistory | Tornado Talk