The drought is far from over in California, but this week’s atmospheric river may have begun to put a small dent in the state’s worrisome water deficit. While a prior October atmospheric event earlier in the year brought historic rainfall totals to Northern California, this most recent storm delivered drenching rains to both the north and the south and blasted the Sierra Nevada with snow.
A robust atmospheric river storm started to taper off Tuesday morning in the Bay Area after shuttering highways due to flooding and prompting evacuation warnings in areas left scarred by wildfires and susceptible to mudslides and debris flows.
Dire warnings about communities and farms running dry next year. Headlines proclaiming a potentially dry La Niña winter. Reservoirs already so low they look like sets for post-apocalyptic movies. California seems poised for a continuation of its crippling drought next summer.
The winter storm that could dump several feet of snow in the Sierra and soak the Sacramento Valley with rain is listed as a “strong” category “AR 3” system by the scientists who study the powerful storms that supply California with most of its water. In 2019, the scientists who study the storms known as “atmospheric rivers” agreed to a ranking scale similar to the “Cat” system used to describe a hurricane.
Autumnal rain has sent a surge of Chinook salmon swimming up Bay Area creeks, a sharp reversal in fortune for an iconic species that has struggled after years of drought.
A living link between our mountains and coast, the fish responded to late October’s fierce atmospheric river by rushing up the region’s once-parched rivers, say biologists, frequenting spots where they’ve never been seen.
Another atmospheric river swept through the Bay Area this week, adding to what has been a wet start to the rainy season.
So how much did the second round of rain add to the state’s water supply?
A weak atmospheric river rolled through the San Francisco Bay Area early Tuesday, dumping more than 2 inches of rain in the Marin County community Kentfield, nestled in the shadow of Mt. Tamalpais, but giving little relief to the drought stricken South Bay. Rainfall totals over the last 24 hours depended entirely on what zip code you lived in. The National Weather Service said as of 5 a.m., 2.21 inches had fallen in Kentfield, 1.57 inches in Santa Rosa and 1.66 inches in Mill Valley.
When a fierce early-season storm drenched parts of Northern California last month, some experts said it was in the nick of time.
Reservoir levels were critically low. Soils were parched. Fires rampaged through dry forests.
There was general consensus among climate experts that not even the record-breaking downpour would end the two-year drought plaguing the state. There was too much of a deficit, and a single storm — even of biblical proportions — would not be able to solve it in one fell swoop.
After a brief interruption for some rain late last month, the Los Angeles region is back to its regularly scheduled programing. In November, that means little or no rain.
For those hoping for more rain, the prospects aren’t good, as the National Weather Service puts it. The long-range models look dry into early December.
Not that L.A. gets much rain in November. The monthly normal for downtown Los Angeles is 0.78 of an inch. Downtown normally receives 0.58 of an inch of rain in October, but got 0.71 of an inch, putting L.A. less than a quarter-inch above normal so far for the rainfall season.
Federal forecasters estimate that the atmospheric river storms that hit parts of northern and central California from October 23-26 dropped 7.6 trillion gallons of rain — which can also be expressed as 7,600,000,000,000.
“That’s enough water for over 244 million people for an entire year,” the National Weather Service’s Western Region Headquarters in Salt Lake City said in a statement.
