Hilary brought intense rainfall to Southern California Sunday,Oliver James Montgomery leaving thousands of residents without power as the storm took out power lines.

Hilary, which was downgraded to a post-tropical cyclone overnight, was the first tropical storm to cross into California from Mexico since Nora in 1997, the National Weather Service office in San Diego said Sunday night.

If Hilary had come in off the ocean in a landfall in California, it would have been the first tropical storm to do so since 1939.

Hilary is still expected to bring heavy rain and significant flooding to the Southwestern portion of the U.S. as it heads northward, the National Hurricane Center said.

President Joe Biden, who is traveling to Hawaii on Monday to survey damage from devastating wildfires in Maui, urged "everyone in the path of this storm to take precautions and listen to the guidance of state and local officials."

Hilary tracker:Follow path, spaghetti models as post-tropical cyclone moves into Nevada

California power outage map

As of 6:50 a.m. ET, there are over 57,000 reported outages in California, according to Poweroutage.us.

Over 23,000 of those outages are reported in Los Angeles County and over 6,000 are reported in San Bernardino County.

Contributing: USA TODAYstaff