Some parts of the state were expected to get close to a year’s worth of rainfall during the storm.
Tens of thousands were without power in Southern California on Sunday night after Tropical Storm Hilary brought damaging winds and the threat of “life-threatening flooding” to the region, prompting warnings across the state and as far north as Oregon and Idaho.
The center of the storm made landfall in Southern California near Palm Springs on Sunday night after passing through Mexico. Emergency officials urged residents across the state to stay indoors and off flooded roads, and schools in Los Angeles and San Diego canceled classes on Monday.
“THIS IS LIFE THREATENING FLOODING!!!!!!” the Los Angeles office of the National Weather Service wrote on Sunday night. The agency declared a flash flood warning for parts of Los Angeles and Ventura counties into early Monday morning.
HEADS UP!!!!!
DANGEROUS FLOODING IN THE AREA BETWEEN POINT DUME…POINT MUGU…CAMARILLO…WESTLAKE VILLAGE…SOMIS AND SPANISH HILLS.
THIS IS LIFE THREATENING FLOODING!!!!!! #CAwx
— NWS Los Angeles (@NWSLosAngeles) August 21, 2023
Palm Springs had already seen 2.82 inches of rain on Sunday, shattering monthly rainfall records. Its average annual rainfall is 4.66 inches.
“You do not want to be out driving around, trying to cross flooded roads on vehicle or on foot,” Michael Brennan, the director of the National Hurricane Center, said during a news briefing, per The Associated Press. “Rainfall flooding has been the biggest killer in tropical storms and hurricanes in the United States in the past 10 years, and you don’t want to become a statistic.”
Maximum sustained winds were near 45 mph, but weather officials expected the storm to weaken into a post-tropical cyclone by early Monday. Large parts of California and Nevada were expected to see 3 to 6 inches of rain, with some areas experiencing up to 10 inches in total.
The National Weather Service said those regions should expect “dangerous to catastrophic flooding.”
8 PM PDT Aug 20: Life-threatening and catastrophic flooding from #Hilary is ongoing over portions of the Southwestern U.S and Baja California. For more information, visit https://t.co/Oy8uoeSibM pic.twitter.com/CEJpx291QW
— NHC Eastern Pacific (@NHC_Pacific) August 21, 2023
The intensity of the storm and the fact that a hurricane was heading toward California at all has already sparked concerns from climate scientists who have long warned such events will only become more frequent and more severe as climate change continues. It’s too soon to say if Hilary was made more severe by our warmer world, but researchers released a shocking report in 2020 that found climate change is already making hurricanes stronger.
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