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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. During the La Niña phase, the jet stream is much further north, and therefore the far northern portions of California are wetter, while the southern ...
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.
Southern California had become increasingly arid since late summer 2024, with storm systems predominantly affecting the Pacific Northwest and Northern California instead, as a result of the El Niño–Southern Oscillation (ENSO) shifting from El Niño to La Niña. La Niña conditions had emerged over the tropical Pacific Ocean by December 2024.
In addition, climate change has impacted California's precipitation patterns in recent years with effects including more rapid snowmelt, more frequent heatwaves, and drier conditions across the state. [21] California precipitation and snowpack is measured by the state of California by "water year", which runs from October 1 to September 30. [22]
On Wednesday, an influx of moisture finally reached across areas of Southern California. Rainfall totals in downtown Los Angeles rose to 0.34 of an inch, breaking the 20-day dry streak for the city.
For many along the California coast and parts of the Central Valley, rain amounts with the latest event are expected to tally 0.50 of an inch to an inch through Thursday.
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.
As yet another atmospheric river-fueled storm produces days of deluge in California, the state faces ... heavy rainfall, Downtown Los Angeles has now picked up 14.38 inches of rain since Jan. 1 ...