A flash flood warning was issued for Los Angeles County on Sunday afternoon after Tropical Storm Hilary made landfall in Baja California, Mexico—as the southwestern U.S. prepares for “catastrophic flooding” and heavy winds from Southern California’s first tropical storm since 1939.

Even parts of Los Angeles and Orange counties not expected to feel the full brunt of the system could see flash floods.

With Tropical Storm Hilary just making landfall in California at 5 p.m. Sunday, the rainfall totals across the southern half of the state are already astonishing.

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Tropical Storm Hilary has made landfall on Mexico's Baja California peninsula, pushing torrential rains on a northward path, and causing flooding. The system has prompted the first-ever Tropical Storm Watch warning for Southern California.

The warning extended from the Mexico-California border to Point Mugu, about 40 miles west of Santa Monica by road. It also includes Catalina Island, where officials urged some residents to evacuate. Gov. Gavin Newsom of California declared a state of ...