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An atmospheric river dumping rain across Northern California and several feet of snow in the Sierra was making its way across the state Friday, bringing flooding and threatening mudslides along ...

Get top local stories in Southern California delivered to you every morning. Sign up for NBC LA's News Headlines newsletter. The excess in water could have potentially come from rainy weather this ...

WHAT IS AN ATMOSPHERIC RIVER? It starts when a large amount of water vapor from tropical oceans is carried by a jet stream ...