Hilary live updates: Roads flood as Southern California sees historic rainfall

(NEW YORK) — Tropical storm warnings are in effect for more than 42 million people in Southern California as Hilary hits the region, flooding roads and knocking out power.

Once a Category 4 hurricane, Hilary weakened as it approached the West Coast. Flood watches are in effect from Southern California and Arizona to Oregon and Idaho.

Here’s how the news is developing. All times Eastern:

Aug 21, 7:58 AM EDT
Flash flood warnings continue amid record rain

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

Aug 21, 3:27 AM EDT
Thousands without power as storm downs trees

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.

Aug 21, 2:28 AM EDT
Interstate through Cathedral City closes amid flooding

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.

Aug 20, 11:34 PM EDT
Hilary winds slow down, but flash flood warnings remain

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

Aug 20, 10:03 PM EDT
Hilary moves into Southern California

Hilary is continuing as a tropical storm with maximum sustained winds now down to 50 mph as of 5 p.m. PT Sunday. The center of Hilary has now officially moved into Southern California and is located about 25 miles south, southwest of Palm Springs. It is currently moving north at 23 mph.

– ABC News Meteorologist Daniel Peck

Aug 20, 5:29 PM EDT
All Southwest and Frontier airline flights suspended out of Ontario, California, airport

Ontario International Airport has suspended all Southwest Airlines and Frontier Airlines flights from Sunday at noon until Monday as Tropical Storm Hilary has begun to impact the West Coast, the airport said on social media.

Southwest Airlines has canceled 715 flights, the most flights of all U.S. airlines, according to FlightAware.

Frontier canceled 71 flights, according to FlightAware data.

Aug 20, 3:53 PM EDT
Latest maps show path of storm over the Southwest

The National Weather Service has issued a flash flood warning for parts of Southern California as the region begins to experience the effects of Tropical Storm Hilary.

Los Angeles County, including downtown Los Angeles, and Ventura County were included in the advisory.

Heavy rain is now becoming more widespread across portions of the region. The heaviest rain is focused over much of the Interstate 5 corridor, north of San Diego into Los Angeles.

Rainfall rates up to 1 inch per hour are possible in this area, and flash flooding will likely develop, forecasts show.

Rounds of heavy rain are expected to continue to sweep across the greater Los Angeles metro area through the next several hours.

Hilary will then move northward over the next 24 hours. As the system moves over land, it will weaken and become disorganized but could remain a tropical storm as it tracks across Southern California.

A tropical storm warning remains in effect for San Diego, Palm Springs, Riverside and Los Angeles.

Flood watches remain across a large swath of the Southwest, including cities like San Diego, Palm Springs, and Las Vegas. These watches have also been extended northward up to Idaho for the potential for heavy rain and flash flooding early in the week.

The National Oceanic and Atmospheric Administration’s Weather Prediction Center has issued a high risk alert for excessive rainfall across Southern, California, from Palm Springs to San Bernardino and up to Death Valley. “High Risk” days are rare and typically dangerous — 39% of all flood-related fatalities and 83% of all flood-related damages in the U.S. occur on “High Risk” days, records show.

A moderate risk alert for extreme rainfall is in effect from Las Vegas to San Diego and Los Angeles.

The biggest rainfall totals will be across the mountains east of San Diego, north and east of Los Angeles. Through Monday, a widespread 1 to 3 inches of rain is forecast across much of Southern California, the desert Southwest and across southern Nevada.

Three to 6 inches or more of rain is forecast across the mountains areas in Southern California. Several inches could still fall in some desert locations, with the greatest chance closer to Death Valley. Isolated amounts of 6 to 10 inches are still possible in some regions.

One to 2 inches of rainfall quickly falling in a desert location can cause major impacts due to the oversaturated soil.

-ABC News’ Daniel Peck

Aug 20, 2:18 PM EDT
Hilary makes landfall in Baja California, Mexico

Tropical Storm Hilary has made landfall just south of the U.S. border.

The storm system moved over the northern Baja California peninsula in Mexico at about 11 a.m. PT, the National Hurricane Center said in its latest advisory.

Hilary is currently located aout 215 miles south-southeast of San Diego and is moving north-northwest at 25 mph.

Maximum sustained winds have weakened to 65 mph.

The storm is expected to move through Southern California on Sunday afternoon, bringing catastrophic and life-threatening flooding over portions of the Southwest through Monday.

-ABC News’ Dan Peck

Aug 20, 1:11 PM EDT
Nearly 1,000 flights canceled ahead of storm

Airlines have canceled 944 flights so far as Tropical Storm Hilary approaches the West Coast, according to FlightAware.

The majority of the affected airports are in the West.

Southwest Airlines has cancelled 683 flights, the most flights of all U.S. airlines.

The airline has canceled all flights in and out of Palm Springs International Airport until at least Monday.

-ABC News’ Sam Sweeny

Aug 20, 11:29 AM EDT
Hilary weakens to a tropical storm

Hurricane Hilary, once a Category 4 hurricane, was downgraded to a tropical storm Sunday as it approaches the West Coast.

The center of the storm system is currently located about 220 miles south-southeast of San Diego. It is moving about 25 mph to the north-northwest.

About a quarter of an inch of rain has already fallen in Palm Springs on Sunday morning, while San Bernardino has seen about .8 of an inch, according to the National Weather Service.

Tropical storm force winds will start moving into Southern California over the next few hours.

Catastrophic and life-threatening flooding is likely over portions of the Southwest through Monday, forecasts show.

-ABC News’ Kenton Gewecke

Aug 19, 11:13 PM EDT
Hilary weakens to category 1 hurricane

Hilary continues to weaken as it moves north-northwest, now a category 1 hurricane with maximum sustained winds of 90 mph.

Aug 19, 10:53 PM EDT
Evacuation orders issued for areas of San Bernardino County

The San Bernardino County Sheriff’s Department issued a mandatory evacuation order for several regions at 7:15 p.m. PT. The regions include Oak Glen, Forest Falls, Mountain Home Village, Angelus Oaks, and northeast Yucaipa.

Earlier Saturday, San Bernardino County Sheriff’s issued an evacuation warning to its residents. At the time, San Bernardino County spokesperson David Wert told ABC News, “The purpose is to warn the population that there is an impending danger. They should start making arrangements to evacuate.”

The Sheriff’s office released an evacuation map to help residents know if they’re in the affected area.

Aug 19, 8:58 PM EDT
Gov. Newsom declares state of emergency ahead of Hurricane Hilary

California Governor Gavin Newsom declared a state of emergency for much of Southern California on Saturday ahead of Hurricane Hilary making landfall.

“California has thousands of people on the ground working hand-in-hand with federal and local personnel to support communities in Hurricane Hilary’s path with resources, equipment and expertise,” the governor said in a statement.

There are currently “more than 7,500 boots on the ground deployed” to help local communities the governor’s statement continued.

The impacts of the storm are expected to begin Saturday evening lasting through Monday, according to the statement.

Aug 19, 7:39 PM EDT
Biden briefed on Hurricane Hilary

President Joe Biden has received a briefing from senior staff on the latest preparedness plans for Hurricane Hilary and his team is working with state and local agencies ahead of the storm, according to the White House.

FEMA Administrator Deanne Criswell said earlier she has been providing “continuous updates” to the White House ahead of the storm.

-ABC News’ Justin Gomez

Aug 19, 6:22 PM EDT
LA County Parks to temporarily close

The County of Los Angeles Parks system said it will close on Sunday and Monday “out of an abundance of caution” due to Hilary.

That includes trails, lakes, beaches, pools, botanical gardens and playgrounds. All programs and classes are also canceled.

“While parks are not fenced in, visitors are encouraged to stay home,” LA County Parks said.

-ABC News’ Jennifer Watts and Alex Stone

Aug 19, 5:25 PM EDT
Hilary weakens to category 2 hurricane

Hilary continues to weaken as it moves north-northwest, now a category 2 hurricane with maximum sustained winds of 110 mph.

Aug 19, 5:25 PM EDT
FEMA in touch with California, Nevada governors

FEMA Administrator Deanne Criswell told reporters she is providing “continuous updates” to the White House about preparations ahead of the storm.

Criswell said she has also been in contact with California Gov. Gavin Newsom and Nevada Gov. Joe Lombardo to discuss “what type of support that they may need from FEMA and the federal family, but also to remind them that we are ready to support them as needed for this storm.”

Criswell said they will not be moving any resources from Maui to California or Nevada to respond to the storm.

“We are still fully engaged in our efforts to help the state and people of Hawaii recover but it’s also equally important that we are making sure communities that are in the path of Hilary also have the resources that they may need, and to what is likely going to be heavy impacts from rain and flooding,” she said.

-ABC News’ Justin Gomez

Aug 19, 4:49 PM EDT
Evacuation warning issued for areas of San Bernardino County

The San Bernardino County Sheriff’s office has issued an evacuation warning to residents in parts of the county.

“An evacuation warning is not an evacuation order — it’s a warning to people to be on notice they could be asked to evacuate at any moment,” San Bernardino County spokesperson David Wert told ABC News. “The purpose is to warn the population that there is an impending danger. They should start making arrangements to evacuate.”

The storm is expected to hit San Bernardino County “pretty hard,” Wert said, noting there is a threat of debris flowing into areas downstream of recent brushfires.

“Hopefully the order won’t come, but we want people to be ready,” Wert added.

-ABC News’ Samira Said

Aug 19, 4:06 PM EDT
Rare ‘high risk’ forecast for excessive rainfall issued

The National Oceanic and Atmospheric Administration’s Weather Prediction Center issued a rare “high risk” forecast for excessive rainfall for Sunday across a large swath of Southern California, from Palm Springs up toward Death Valley.

“High risk” forecasts are only issued a couple times a year on average, and 39% of all flood-related fatalities and 83% of all flood-related damages in the U.S. occur on those days.

A “moderate risk” for extreme rainfall has also been issued from Las Vegas to San Diego and Los Angeles. Numerous flash floods could unfold in these areas as well, with some of them potentially significant and very dangerous.

The deadliest hazard associated with tropical cyclones over the past decade is flooding from heavy rain.

-ABC News’ Dan Peck

Aug 19, 11:50 AM EDT
Southern California expected to see tropical storm winds Sunday

Winds from Hilary will reach tropical storm strength in Southern California on Sunday afternoon as the storm passes by.

Heavy rainfall is expected across the southwestern U.S., peaking late tonight through Sunday night. Rainfall amounts of 3 to 6 inches, with isolated amounts of 10 inches, are expected across portions of Southern California and southern Nevada. Dangerous to catastrophic flooding is expected.

Elsewhere across portions of the western U.S., rainfall totals of 1 to 3 inches are expected, resulting in localized, some significant, flash flooding.

-ABC News’ Kenton Gewecke

Aug 19, 11:50 AM EDT
Hurricane Hilary downgraded to a category 3 storm

Hurricane Hilary has entered cooler water and is starting to weaken, now a category 3 hurricane with sustained winds reaching 125 mph as it moves north-northwest at 16 mph.

Landfall is expected in Mexico on Sunday. The storm is then expected to be at tropical storm strength as it enters southern California, marking the first tropical storm in Southern California since Nora in 1997, more than 25 years ago.

Catastrophic and life-threatening flooding is expected in Southern California.

Rain from Hilary should reach California later Saturday. Early morning monsoonal showers have lead to flash flooding Saturday morning, but that is not associated with Hilary.

-ABC News’ Kenton Gewecke