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Pacific Storm That Unleashed Coastal Flooding Pushes Across Southern California Into Arizona
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By Associated Press
Published 4 months ago on
December 22, 2023

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LOS ANGELES — A Pacific storm that pounded coastal areas northwest of Los Angeles brought more heavy rain and scattered roadway flooding as it pushed through San Diego to the deserts on its way into Arizona early Friday.

Impact on Holiday Travel

As millions scrambled to finish their holiday shopping or headed out onto highways, a wide swath of Southern California was expected to remain under a flood watch into the night before the region dries out in time for Christmas.

After slowly moving down the coast during the week, the brunt of the storm reached San Diego late Thursday. Just before midnight, a squall with gusts up to 55 mph (88.5 kph) dumped more than a half-inch (1.5 centimeters) of rain at Point Loma in 30 to 40 minutes, the National Weather Service said.

Rain also began arriving in southwest Arizona. The weather service’s Flagstaff office said the center of the low-pressure system was expected to move from southwest of San Diego to near Yuma by evening.

This satellite image provided by NOAA shows a storm over Southern California Thursday, Dec. 21, 2023. The Pacific storm pounded parts of Southern California with heavy rain and street flooding, adding to hassles as holiday travel got underway. The early morning downpours targeted coastal Ventura County, just to the northwest of Los Angeles County, swamping areas in the cities of Oxnard and Port Hueneme. (CIRA/NOAA via AP)

Storm Unleashes Extraordinary Rainfall

On Thursday, the storm unleashed extraordinary rainfall on coastal counties northwest of Los Angeles, flooding homes and stranding motorists on streets inundated with water.

Downpours swamped areas in the Ventura County cities of Port Hueneme and Oxnard, and about 35 miles (56 kilometers) up the coast in Santa Barbara County.

Between midnight and 1 a.m., the storm dumped 3.18 inches (8 centimeters) of rainfall in downtown Oxnard, surpassing the area’s average of 2.56 inches (6.5 centimeters) for the entire month of December, according to the National Weather Service.

“This is a genuinely dramatic storm,” climate scientist Daniel Swain, of the University of California, Los Angeles, said in an online briefing. “In Oxnard, particularly, overnight there were downpours that preliminary data suggests were probably the heaviest downpours ever observed in that part of Southern California.”

Impact on Local Businesses

Sven Dybdahl, owner of olive oil and vinegar store Viva Oliva in downtown Santa Barbara, said he was grateful that the weather came at the tail end of the holiday shopping season, otherwise he’d be worried about his store’s bottom line.

“It will have an impact, but thankfully it’s happening quite late,” he said.

Storm’s Progression

The storm swept through Northern California earlier in the week as the center of the low-pressure system slowly moved south off the coast. Forecasters described it as a “cutoff low,” a storm that is cut off from the general west-to-east flow and can linger for days, increasing the amount of rainfall.

Despite the storm’s prolific precipitation, it brought little snow to Southern California’s mountains, a condition also being experienced elsewhere in the country.

Winter weather advisories were to remain in effect until 4 a.m. Saturday but forecasters said there would be little, if any, accumulation below 7,500-foot (2,286-meter) elevations.

 

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