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Published February 17, 2014, 09:40 AM

Storm eases Calif. drought

The most powerful winter storm to hit California in more than a year dumped several feet of snow in the high Sierras and soaked lower elevations with rain, easing drought conditions but leaving the state thirsting for more, officials said on Feb. 10.

By: Steve Gorman, Reuters

The most powerful winter storm to hit California in more than a year dumped several feet of snow in the high Sierras and soaked lower elevations with rain, easing drought conditions but leaving the state thirsting for more, officials said on Feb. 10.

The Pacific storm doubled the moisture content of the snowpack in the Sierra Nevada mountain range, a key gauge of the state’s principal source of surface water, says Dave Rizzardo, the chief of snow surveys for the state Department of Water Resources.

But the 3 inches of additional water content measured still leaves California at just 20 percent of where its snowpack should be by April 1, the traditional end of the winter rainy season, Rizzardo says.

Neither Rizzardo nor other experts would venture to say precisely how much more precipitation the state needs to substantially relieve the drought. But several more storms of similar magnitude would be required.

“We’ve dug ourselves quite a hole during the past couple of years, so it takes more than one good storm to get us out of it,” Rizzardo says.

“We’d need another one of these storms weekly for the next several weeks to get back to where we want to be with our water supply,” says Louis Moore, a spokesman for the federal Bureau of Reclamation. The bureau controls irrigation supplies to much of California’s vast Central Valley heartland.

The rainfall runoff also added to the state’s network of man-made water storage, with one badly depleted northern California reservoir, Folsom Lake, rising 17 feet, Moore says. But that still leaves it less than a quarter full.

The state’s two largest reservoirs, at Shasta Dam and Lake Oroville, each grew by a percentage point, leaving both at just more than one-third of their respective capacities.

“It makes a dent, but there’s still a long way to go,” says state Water Resources Department spokesman Ted Thomas.

Coming off its driest year on record, California began 2014 with surface and groundwater supplies extremely low and no sign of a break in the weather, prompting Gov. Jerry Brown to declare a statewide drought emergency.

He urged citizens to reduce water consumption by 20 percent voluntarily, while irrigation districts and municipalities up and down California braced for the sharpest cutbacks in deliveries from state and federal water projects.

Idle cropland

Agriculture officials say farmers in California, which grows half the nation’s fruits and vegetables, are expecting to idle some 500,000 acres of cropland this year in what would be a record production loss for the top U.S. farm state.

One storm alone cannot turn the tide, but it was a welcome development, officials say.

Snowfall from the storm averaged 3 to 5 feet across the Sierras and neighboring mountains, with up to 6 feet measured at the highest peaks, meteorologists says.

The Sacramento Valley received 2 to 4 inches of rain, with 10 to 16 inches soaking the foothills and lower elevations of the Sierra. The coastal mountains north of San Francisco got 10 to 12 inches, forecasters say.

Before Feb. 3, any precipitation moving in from the Pacific had been diverted north into Canada by a ridge of high pressure that was parked for more than two months along the U.S. West Coast, meteorologists for the National Weather Service say.

The latest storm, which they described as an “atmospheric river,” crashed through the barrier as it was starting to weaken and pushed it to the south in a shift that forecasters believe may pave the way for wetter weather in the short term.

“There’s always the possibility of the ridge returning, but the latest model that we can see kind of keeps the ridge relatively weak and not re-establishing itself to the extent that it was through December and January,” says Roger Gass, a National Weather Service meteorologist in Monterey.

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