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The ENSO cycle has a huge effect on rainfall and snowfall patterns in California, especially during the winter and spring seasons. During the El Niño phase, the jet stream is located south through California, allowing for warmer temperatures and more heavy rains to occur, particularly in the southern portions of the state.
The runoff from rainfall used to support many aspects of California infrastructure, such as agriculture and municipal use, will be severely diminished during the drought. While groundwater diminishes at a much lower rate than runoff, the lack of runoff will lead to increased groundwater pumping to meet the needs of the water demand.
The wettest “rain year” from July to the following June was 1883/1884 with 38.18 inches (969.8 mm), and the driest 2006/2007 with 3.21 inches (81.5 mm). [41] The greatest rainfall in one month was 15.80 inches (401.3 mm) in December 1889, which also had the most days – twenty – receiving at least 0.01 inches (0.3 mm) of rain.
California's fire crisis stems from outdated water systems and poor forestry management, critics argue, with progressive politics thwarting realistic solutions.
American Samoa's climate regime is dominated by southeast trade winds. The island dependency is wet, with annual rainfall averaging near 120 inches (3,000 mm) at the airport, with amounts closer to 200 inches (5,100 mm) in other areas. [77] There is a distinct rainy season when tropical cyclones occasionally visit between November and April.
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.
In central and southern California, widespread rainfall totals of 3 to 6 inches are expected – more than a month’s worth of rain for most. Los Angeles averages 2.99 inches of rain in February ...
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.