The term “Atmospheric River” was just formally defined and categorized five years ago. Before that, they were just referred to informally as plumes or surges of moisture. The first time
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A deadly Pacific storm, the second “Pineapple Express” weather system to sweep the West Coast in less than a week, dumped torrential rain over Southern California, triggering street flooding and mudslides throughout the region. Extreme-weather advisories for floods, high wind and winter storm conditions were posted on Monday across parts of California and southwestern Arizona where some 35 million people live, and authorities urged residents to limit their driving. The National Weather Service documented staggering rainfall amounts from the storm, which lashed Northern California on Sunday with hurricane-force gusts of wind, along with heavy precipitation that intensified as the system moved south on Sunday night and Monday.
A powerful atmospheric river is set to bring potentially life-threatening flooding across Southern California on Sunday after an earlier storm already unleashed record rainfall in some parts of the region.