Hilary updates: Over 1 foot of rain hits San Bernardino as LA avoids catastrophe

Flash flood warnings remained in effect on Monday in Los Angeles, Death Valley and some areas of southwest Nevada, after heavy rain fell overnight throughout the region.

Hilary weakened overnight into a post-tropical cyclone and was expected to dissipate in the high mountains of the Sierra Nevada.

Copious amounts of rain fell overnight, including the 10.5 inches that soaked Raywood Flat, California, a rocky area within the San Bernardino National Forest.

About 6.15 inches fell in Los Angeles. Palmdale, a city north of the Los Angeles, had its highest all-time daily rainfall with 3.57 inches.

Palm Springs got 2.82 inches, marking the city’s highest daily rainfall for summer and for August.

San Diego had 1.81 inches, its highest-ever daily August rainfall.

And Bristlecone, Nevada, near Las Vegas, picked up more than 6 inches, mostly within 24 hours. That rainfall broke the record for a tropical cyclone or remnant traveling through Nevada. It approached the 24-hour rain record for the state of 7.78 inches, which was set in 2004.

-ABC News’ Max Golembo

Thousands of customers in Southern California were without power at about midnight, with the highest number of outages in San Bernardino County.

About 14,000 customers were without power in that inland county, along with 7,600 in Riverside County to the south, according to PowerOutage.us, a site that tracks electric providers.

About 7,900 customers in Los Angeles County had experienced power outages as of about 6 p.m. on Sunday, the Los Angeles Department of Water and Power said.

"The City of Los Angeles is responding to reports of flooding, downed trees, and wires as well as other calls for service," the city's emergency officials said in an update. "Zero deaths have been reported in connection with the storm or earthquake thus far. At least 150 tree-related issues and eight mudflows have been reported."

By midnight, about 3,700 customers in Los Angeles were still without power, according to PowerOutages.us.

Traffic headed in both directions on Interstate 10 was brought to standstill as roads flooded in Cathedral City on Sunday, officials said.

“I-10 in Cathedral City from Gene Autry to Bob Hope Dr. is closed due to flooding and debris on the highway. Unknown duration of clear,” the California Department of Transportation’s District 8 said on social media.

Cathedral City is Palm Springs’ neighbor in the Coachella Valley.

Emergency 911 service was knocked out by the storm late Sunday in both cities, police in Cathedral City and in Palm Springs said.

As of 11 p.m. ET/8 p.m. PT, Hilary remains a tropical storm with maximum sustained winds now down to 45 mph. The center of Hilary is located about 105 miles northwest of San Diego. It is moving at 28 mph.

Widespread flash flood warnings remain in effect across Southern California as areas of heavy rain continue to sweep through the region. The flash flood warnings in Los Angeles and Ventura Counties have been extended until 3 a.m. PT Monday. Flash flooding is ongoing across the region. There are also warnings in many desert areas, including Death Valley.

The widespread heavy rain in Southern California will begin to ease up soon, first in the southeastern part of the state. After 10 p.m. PT Sunday, there is a notable improvement regionwide, with the worst of the heavy rain over and the rain becoming less intense. There is lingering rain overnight in some areas but not as heavy as earlier.

Even though the rain ends, there could still be residual impacts, like landslides or rockslides.

- ABC News Meteorologist Daniel Peck