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With each passing week, California's lack of rainfall becomes more serious.
changes in temperature cause high and low pressure zones around the world. In many ways, air works like water. The deeper you swim in the ocean, the stronger the water pressure, because the weight of the water above is pressing down on the water below. Air in the atmosphere also has weight, and as temperatures of the ocean and land fluctuate, the atmospheric pressure also changes, helping Balenciaga Classic City Bag Replica
The first snowpack reading in the Sierra Nevada this month found a snowpack of just 20 percent of normal.
SAN JOSE, Calif. As California struggles through a run of historically dry weather, most residents are looking at falling reservoir levels, dusty air and thirsty lawns.
"I wish I had a really good answer for this," said Daniel Cayan, an oceanographer and atmospheric scientist with the Scripps Institution of Oceanography in La Jolla, Calif. "It's unusual for the pattern to have not broken down to allow some relatively active, vigorous winter storm systems to track across California."
But meteorologists have fixed their attention on the scientific phenomenon they say is to blame for the emerging drought: a vast zone of high pressure in the atmosphere off the West Coast nearly four miles high and 2,000 miles long, so stubborn that one researcher has named it the "Ridiculously Resilient Ridge."
The mass of high air pressure has been blocking Pacific winter storms from coming ashore in California, deflecting them into Alaska and British Columbia, even delivering rain and cold weather to the East Coast. Similar high pressure zones pop up all the time during most winters, but they usually break down, allowing rain to get through to California. This one has anchored itself for 13 months, since December 2012, making it unprecedented in modern weather records and puzzling researchers.
drive much of our weather.
"It's like the Sierra a mountain range just sitting off the West Coast only bigger," said Bob Benjamin, a forecaster with the National Weather Service in Monterey, Calif. "This ridge is sort of a mountain in the atmosphere. In most years, it comes and goes. This year it came and didn't go."
Meanwhile, major California reservoirs like Shasta and Oroville are each 36 percent full, about half of normal for this time of year. San Luis Reservoir near Los Banos is 30 percent full, 42 percent of normal. Major Bay Area water agencies haven't yet called for mandatory summer water restrictions but are expected to make the decision in the next month or two, depending largely on whether the high pressure ridge breaks down and rain falls.
What researchers don't know is why the current high pressure ridge is so persistent or when it is going away, allowing California to enjoy Balenciaga Day Bag some much needed rain. A few scientists say that it may be related to climate change, but nobody knows for sure.
Last year was the driest calendar year in recorded history for most of California, with records going back 160 years. Guess Bag New Collection 2017
Scientists know that Balenciaga 21 Silver City
The current high pressure ridge is even stronger and more persistent than a similar ridge that parked over the Pacific Ocean during the 1976 77 drought, one of the worst in the 20th century.
Meteorological anomaly being blamed for drought
State Department of Water Resources Director Mark Cowin told members of the California State Board of Food and Agriculture in Sacramento a week ago that his agency is likely to recommend that Gov. Jerry Brown make a drought declaration by Feb. 1, which would make it easier for water transfers between agencies and for emergency loans and other assistance.
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