The last time rainfall totals in San Francisco were greater, Abraham Lincoln was president
How wet has it been recently in Northern California?
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 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. The fact that the past three weeks’ rainfall was eclipsed only by the winter of 1862 — a legendary disaster in California history on par or worse than many of its biggest earthquakes — doesn’t mean that a similar fate is likely to occur this spring, experts said.
Now, California has large dams and reservoirs that limit flooding in wet years. There also are thousands of miles of levees and pumps, weirs and other flood control projects that were not in place in the 1860s. But weather experts have become increasingly concerned that if another massive winter like 1861-62 hit — and tree rings and other historical records show they have occurred roughly every 100 to 200 years — millions of people could be trapped by floods, freeways could be shut for weeks, and the damage could reach into the hundreds of billions of dollars.last summer by scientists at UCLA found that the chances of such a huge storm, while still remote, have roughly doubled due to climate change.
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