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Atmospheric River

Final atmospheric river storm will slam the Bay Area today. Here are the biggest impacts

in Weather

A strong high-pressure system in the eastern Pacific Ocean is creeping toward the West Coast, and it’s slated to shut California’s storm door. This is good news for residents across the state who are still reeling from the impacts that were brought on by nearly three weeks of storms — enhanced by a series of powerful atmospheric rivers. But this historic wet pattern isn’t done with Northern California just yet. A final round of moisture from the Pacific Ocean will stream into the Bay Area and Sierra Nevada this afternoon, ushering one last round of rain and snow bands before the wet pattern ends.

Continue Reading on the San Francisco Chronicle

What’s Driving Relentless Storms Against the West Coast?

in Weather

Due to two catastrophic anomalies occurring at the same time over the West Coast, two terms, “atmospheric river,” and “bomb cyclones” will be forever remembered as the cause of record amounts of rain, flash flooding, and mudslides this year as a near continuous storm lasting from Dec. 31 to Jan. 9 occurred throughout the region. 

Breaking a years-long dried streak, the 2022-2023 winter season brought in unseasonably wet conditions as multiple atmospheric rivers, frontal systems, and a “bomb cyclone” inundated the entire coastline, resulting in heavy rainfall that saturated much of California, and caused localized riverine and flash flooding, causing mudslides in the process.

Continue Reading on DS News

3 more atmospheric rivers headed for Sonoma County. What’s driving the storm train?

in Weather

January is typically atmospheric river season in California, but since the start of the new year Sonoma County has been hammered by an almost nonstop series of them — an unusual occurrence, which experts are attributing to the jet stream that is surging over the Pacific Ocean.

Literally described as rivers in the sky, three more of these moisture-laden events are being carried by winds toward the Golden State, according to meteorologists, who expect more storms to begin Wednesday night.

Those storms will continue through Jan. 20, said Chad Hecht, a research and operations meteorologist with UC San Diego’s Center for Western Weather and Water Extremes.

Continue Reading on The Press Democrat

Thousands still without power in Sonoma County

in News

A torrent of rain, fueled by what meteorologists described as an “atmospheric river,” wreaked havoc starting Saturday night, worsening throughout the day before easing locally Sunday evening.

Here is the latest on the storm and its aftermath:

3:30 p.m.

River flows a day after the atmospheric river passed over Sonoma County are about as epic as you’d expect.

“It’s been a while,” U.S. Geological Survey field office Chief Andrew Watson said Monday when asked how long it had been since he’d seen this amount of water flowing in the North Bay. “Peaks at all our sites are substantially higher than last year.”

How high?

Watson was measuring volume on the Russian River in Healdsburg when a reporter reached him. As he noted, average flow at that spot for Oct. 25 over the past 82 years is 286 cubic feet per second. The river he had just measured was at 11,200. And at its crest, around midnight as Saturday became Sunday, was more than 18,000 feet per second.

Continue Reading on The Press Democrat

‘It’s A Big One’; Weekend Atmospheric River Gaining Intensity Off California Coast

in Weather

SAN FRANCISCO (CBS SF) — While San Francisco Bay Area residents dodged light raindrops early Wednesday, a much larger atmospheric river continued to intensify off the coast, carrying with it the threat of up to 5 inches of rain in the coastal mountains this coming weekend.

The large plume stretched hundreds of miles across the Pacific, pulling in tropical moisture from the Hawaiian Islands — an unusual development for this time of the year.

When asked about the intensity of the storm, Marty Ralph, director of the Center for Western Weather and Water Extremes in La Jolla, didn’t mince words.

Continue Reading on CBSSF Bay Area

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