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Golden Gate Bridge in fog Snow in the mountains of Southern California Summer in the Sierra Nevada at Lake Tahoe High precipitation in 2005 caused an ephemeral lake in the Badwater Basin of Death Valley. The climate of California varies widely from hot desert to alpine tundra, depending on latitude, elevation, and proximity to the Pacific Coast.
While some measurements suggest the 2015-2016 El Niño was the strongest on record since 1950, [29] Southern California received below average precipitation contrary to what the Climate Prediction Center predicted leading up to the winter months.
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]
Southern California rain totals from the latest atmospheric river storm topped 10 inches in some areas, easily besting the average for the entire month of February.
Southern California’s first rainfall of the year could help or hurt wildfire victims as fire spreads in San Diego area. Andy Rose, Holly Yan and Karina Tsui, CNN. January 25, 2025 at 6:53 PM.
Locations farther inland in Southern California like Bakersfield, Lancaster and Victorville are projected to pick up anywhere from 0.25-0.50 of an inch of rain during this event.
[30] [31] Tropical cyclones from the eastern Pacific contribute to the moisture within the monsoon system, and bring up to 20 percent of the average annual rainfall to southern California. [32] Flash flooding is a serious danger during the monsoon season. Dry washes can become raging rivers in an instant, even when no storms are visible as a ...
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 .