Southern California and Southwest brace for Tropical Storm Hilary after it makes landfall in Mexico

Southern California and the Southwest were preparing for "catastrophic and life-threating flooding" as Tropical Storm Hilary continued north after making landfall in the northern part of Mexico's Baja California peninsula on Sunday. 

Hilary had strengthened to a Category 4 hurricane before weakening to a tropical storm prior to making landfall. The storm is still expected to bring heavy rainfall along its path from Sunday afternoon into Monday morning, according to the latest advisory from the National Hurricane Center. 

"The potentially historic amount of rainfall is expected to cause life-threatening to catastrophic flash, urban, and arroyo flooding including landslides, mudslides, and debris flows through early Monday morning," NHC said.