How it affects California’s drought – Times-Herald – /


The Pacific storm conga line that hit Northern California prior to now week was a file crush.

With 4.05 inches of rain in 24 hours, Sunday was the rainiest October day in San Francisco’s historical past and the fourth rainiest day in historical past, returning to the 1849 gold rush. That is a tremendous feat in October, normally not a really wet month.

Equally, in San Jose, it rained 50% of the earlier 12 months on weekends. In East Bay, I fell off through the week at Berkeley’s Tilden Park and the summit of Mount Diablo. And Marin County, the centerpiece of this weekend’s highly effective atmospheric river, resulted in a panoramic 26-inch on prime of Tamalpais Creek when every little thing was mentioned.

Does the Flood imply the top of a extreme drought in California? No, specialists mentioned the clear sky was again on Monday.

However it’s a fantastic begin to the wet season this winter, sending tens of billions of gallons to unusually low reservoirs, ending the fireplace season in a lot of the state, and beginning an extended job of recharging rivers and groundwater. They mentioned.

“This was a frog choker, but not a drought buster,” said Jeffrey Mount, an emeritus professor of earth and planetary science at the University of California, Davis. “We are still in the drought, but this storm has sanded some of its rough edges.”

He estimated that California needed five more large atmospheric river storms to fill its reservoir and end the drought.

Northern California forecasts suggest that this week will be overall dry weather. Given that the last two years were the driest in Northern California between 1976 and 1977, water managers and meteorologists want repeated storms in November to maintain momentum. increase.

Mount, a senior researcher at the Water Policy Center at the California Institute of Public Policy, said:

The storm brought San Francisco’s total monthly rainfall to 7.04 inches in October. This is the second rainiest October since 1849, when modern weather records began, after October 1889, when 7.28 inches fell.

“It’s more than a drop in a bucket,” said Jannul, a meteorologist at the Golden Gate Meteorological Department in Half Moon Bay. “But it doesn’t fill the bucket.”

Why? The calculation is as follows: In San Francisco, it has rained only 20.67 inches in the last two years until June 30th.

San Francisco has the oldest set of accurate weather records and is commonly used as an indicator of Bay Area weather trends.

The historical average for two years is 45.78 inches. As a result, this winter season began down 25.11 inches. In other words, it didn’t rain for a year. To regain that deficit, the city will need a staggering 48-inch rain by June next year.

This happened only once in the recorded history. In the winter of 1861-62, the newly elected Governor Leland Stanford arrived at the inauguration in the city of Sacramento on a rowing boat, dropping 49 inches. The Bay Area approached between 1997 and 1998, and the Ernino storm caused a 47-inch storm in San Francisco, causing widespread flooding throughout Northern California.

Millbrae, CA – October 25: A flood on Millbrae Avenue near Highway 101 in Millbrae, California disrupted traffic on Monday, October 25, 2021. The strongest “atmospheric river” storm that hit the Bay Area in two years has passed. Sunday bay area. (Mercury News)

The effects of last week’s storm continued on Monday.

The National Weather Service issued high-wave warnings from the Point Reyes National Sea to Big Sur until Tuesday. Forecasters warned of 20-30 feet of breaking waves on the beach and life-threatening rip currents.

Water managers carefully checked the reservoir on Monday and generally liked what they saw.

Lake Oroville, California’s second-largest reservoir in Butte County, raised its water level by 23 feet, adding 135,000 acre-foot of water last Monday to Monday afternoon. This is enough water for the annual needs of 675,000 people. However, Oroville was only 26%, up from 22% a week ago.

Lake Shasta, California’s largest reservoir near Reading, rose two feet, only from 21% to 22%. Experts say the lake is 35 miles long and will take some time to recover, despite billions of gallons of water flowing from the moist basin.

In the Bay Area, 10 reservoirs owned by the Santa Clara Valley Water District increased from 10% to 11% in a week.

Tony Estremera, Chairman of the Santa Clara Valley Water District, said: “We all need to continue to play our part in saving water.”

Similarly, seven reservoirs operated by the East Bay Municipal Utility District added 5,000 acre-foot, up from 55% a week ago to 56%. The dry reservoirs in Marin County have improved, increasing from 32% to 43%.

In the Santa Cruz Mountains, the Loch Lomond Reservoir near Ben Lomond, which rained nine inches a week, rose one foot, filling 53% to 54%.

Water managers said much of the water had soaked into the dry ground, but expects the reservoir to rise slowly this week as the burgeoning streams flow downhill.

In some areas of the Sierra Nevada, it snowed more than three feet from Sunday to Monday morning.

“It’s pretty crazy,” said Chris Beam, a cook at Donner Ski Ranch, 10 miles northwest of Lake Tahoe. “I haven’t seen such snow since March. As we’re talking, the general manager is plowing the parking lot.”

According to county spokesman Jason Hoppin, several trees have fallen in the Santa Cruz Mountains, where 3,300 homes were ordered to evacuate on Sunday due to fears of landslides in an area burned down by a wildfire last year. , A small flood occurred.

Null pointed out that six of the last nine rainiest Octobers in San Francisco ended with above-average rainfall.

“It’s a good start,” he said. “It’s a really good start, but that doesn’t guarantee we’ll get a good finish.”

Bay Area newsgroup reporters Summerlin and Will Houston contributed to the story.

Donner Ski Ranch, 10 miles northwest of Lake Tahoe, received more than two feet of fresh snow on Sunday, October 24, 2021 in an early atmospheric river storm. (Photo Claudia Salas, Donor Ski Lunch)

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How it affects California’s drought – Times-Herald – /

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