Based on a key measurement, this year's extreme El Niño has surpassed the 1997-1998 phenomenon, making it now the strongest ever recorded. That could mean abnormal weather for all of North America, including big snow in the Southwest, torrential rain in Southern California, and a drier-than-normal winter in the Northeast. Urban areas like Los Angeles are already prepping on how to handle the monster El Niño, with city agencies warning of flooding, mudslides, and lots of rain. Here's what you need to know about how this latest development will influence winter across the United States.
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