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The past 3 weeks were the wettest in 161 years in the Bay Area

Paul Rogers, The Mercury News on

Published in Weather News

SAN JOSE, Calif. — How wet has it been recently in Northern California?

New rainfall totals show that no person alive has ever experienced a three-week period in the Bay Area as wet as these past 21 days. The last time it happened, Abraham Lincoln was president.

From Dec. 26 to Jan. 15, a total of 17 inches of rain fell in downtown San Francisco. That’s the second-wettest three-week period at any time in San Francisco’s recorded history, since daily records began in 1849 during the Gold Rush. And it’s more than five times the city’s historical average of 3.1 inches over the same time.

The only three-week period that was wetter in San Francisco — which is often used as the benchmark for Bay Area weather because it has the oldest records — came during the Civil War, when a drowning 23.01 inches fell from Jan. 5 to Jan. 25, 1862 during a landmark winter that became known as “The Great Flood of 1862.”

“The rainfall numbers over the past three weeks just kept adding up. They became a blur,” said Jan Null, a meteorologist with Golden Gate Weather Services in Half Moon Bay who compiled the totals. “We had a strong jet stream that was bringing in storms, one after another. It was hard along the way to separate the individual storms.”

So much rain fell since Christmas in Northern California that some cities, including Oakland, Stockton, Modesto and Livermore, already have reached their yearly average rainfall totals. In other words, if it didn’t rain another drop until October, they would still have a normal precipitation year.

 

The parade of soaking storms, which have caused flooding in the Central Valley, Salinas Valley and Santa Cruz Mountains, along power outages, mudslides, and at least 20 deaths statewide, left the Sierra Nevada with statewide snowpack 251% of normal on Tuesday.

Light rain is expected Wednesday night, but otherwise forecasts call for dry conditions for much of the rest of January. River levels now are dropping.

“We’ve gotten so much water and so much snow,” said Daniel Swain, a climate scientist at UCLA. “It’s going to help us dry out and dig out heading into late January. It’s really good news because it takes off the trajectory toward worsening flooding.”

For a sense of how much worse it has been, consider the winter of 1861-62.

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