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The climate of California varies widely from hot desert to alpine tundra, depending on latitude, elevation, and proximity to the Pacific Coast. California 's coastal regions, the Sierra Nevada foothills, and much of the Central Valley have a Mediterranean climate , with warmer, drier weather in summer and cooler, wetter weather in winter.
During El Niño events, increased precipitation is expected in California due to a more southerly, zonal, storm track. [21] California also enters a wet pattern when thunderstorm activity within the tropics associated with the Madden–Julian oscillation nears 150E longitude. [11]
The Peninsular Ranges also form a rain shadow on the Colorado Desert region of California and on much of the larger Sonora Desert. [34] The ranges are affected by the marine layer that provides cooling temperatures and fog, and rainfall varies seasonally with tropical storm activity.
San Francisco, with a historical February rainfall average of 3.96 inches, is forecast to get up to 4 inches. Redding averages 5.48 inches in February but could see 4-8 inches by Wednesday ...
While isolated, heavy rainfall of up to 0.5 inches an hour is expected, forecasters say it will generally be beneficial for the region. But the ground in LA hasn’t seen a drop of rain this year.
California receives an average rainfall of 24 inches in a year. The rain, fuelled by an atmospheric river weather system, is expected to dump more water on Tuesday, the NWS said.
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. [31]
Rain continues to fall in Southern California from an atmospheric river, raising the risk for additional mudslides with more than 120 reported so far in Los Angeles.