Rain on the way: California Weather Update + Atmospheric rivers explained

Tuesday evening First Alert Weather forecast 12/16/25

Kacey Montoya's forecast

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WEATHER IN AMERICA🌦️: Active weather conditions return to the West Coast as another atmospheric river threatens to bring more flooding across the region. Meanwhile, the Northeast braces for frigid temperatures that will track south. FOX Weather Meteorologist Britta Merwin has your forecast.

Atmospheric River's Strength As Seen From Space