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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.
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 .
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.
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 ...
Southern California rainfall total approaches 10 inches in some areas ... On southbound I-5 the right lane is closed from Stadium Way to State Route 110. ... wind gusts peaked at 61 miles per hour ...
The Santa Anas are katabatic winds (Greek for "flowing downhill") arising in higher altitudes and blowing down towards sea level. [7] The National Weather Service defines Santa Ana winds as "a weather condition [in southern California] in which strong, hot, dust-bearing winds descend to the Pacific Coast around Los Angeles from inland desert regions".