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In San Francisco, there were 35 inches of precipitation in December 1861-January 1862, and almost 50 for the season. [16] There were four distinct rainy periods: The first occurred on December 9, 1861, the second on December 23–28, the third on January 9–12, and the fourth on January 15–17. [ 17 ]
Napa, north of San Francisco, recorded its worst flood to this time [29] while nearby Calistoga recorded 29 inches (740 mm) of rain in 10 days, creating a once-in-a-thousand-year rainfall event. [27] Records for 24-hour rain events were reported in the Central Valley and in the Sierra. Thousand-year rainfalls were recorded in the Sierras. [1]
2022–2023 California floods. Periods of heavy rainfall caused by multiple atmospheric rivers in California between December 31, 2022, and March 25, 2023, resulted in floods that affected parts of Southern California, the California Central Coast, Northern California and Nevada. [3][4] The flooding resulted in property damage [5][6][7] and at ...
9 [1] Property damage. $2.94 billion (2023) [2] The 1997 California New Years Floods resulted from a series of winter storms, from December 26 to January 3 of 1997, fed with tropical moisture by an atmospheric river. It impacted Northern California, resulting in some of the most devastating flooding since the Great Flood of 1862.
The storms caused record-breaking rainfall totals to be observed in multiple areas, as well as the declaration of states of emergency in multiple counties in Southern California. [3] [4] Wind gusts of hurricane force were observed in San Francisco, along with wind gusts reaching over 100 miles per hour (160 km/h) in the Sierra Nevada.
A more widespread Level 3 risk exists for much of coastal California, including San Francisco down through Los Angeles. ... widespread rainfall totals of 3 to 6 inches are expected – more than a ...
In San Francisco, an all-time record was set of 2.49 in (63 mm) in a 24-hour span, greater than any other total since records began in 1849. At higher elevations, significant amounts of snow fell; exact totals are not known, but estimated to be at least several feet. Strong winds also accompanied the record rainfall.
In the coastal and southern parts of the state, and much of the Sacramento River system, the primary threat is rain floods in the November–April wet season. Oceanic "atmospheric river" or Pineapple Express storms can generate massive precipitation in a short period (often up to 50 percent of the total annual rainfall in just a few storms). [45]