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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]
One of the bomb cyclones related to the floods on January 4. Oakland set a record for 24 hour rainfall at 4.75 in (121 mm) of rain on December 31, while San Francisco recorded its second wettest day with 5.46 in (139 mm) of rain.
Deaths. >4,000 [ 1 ] Property damage. $100 million (1861 USD) [ 2 ] $3.117 billion (2021 USD) The Great Flood of 1862 was the largest flood in the recorded history of California, Oregon, and Nevada, inundating the western United States and portions of British Columbia and Mexico. It was preceded by weeks of continuous rains and snows that began ...
The Hetch Hetchy Aqueduct carries water from the Tuolumne River to San Francisco and other Bay Area regions. The system starts in Hetch Hetchy Valley, inside Yosemite National Park. The system also generates up to 400MW of electrical power, depending on rainfall, most of which is sent to San Francisco via city-owned power lines. [63]
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.
Los Angeles averages 2.99 inches of rain in February – their wettest month of the year on average. In the mountains and foothills of Southern California the weather service is forecasting up to ...
In Southern California, the temperature differences are approximately 4 °F in winter and 23 °F (2 °C and 13 °C) in summer. At the coast in Santa Monica, the average high in August is 75 °F (24 °C), while in Burbank, approximately 10 miles (16 km) inland, the average high in August is 95 °F (35 °C): a temperature gain of about two ...
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]