Storms Dump Billions of Gallons of Water Into Lake Tahoe

Blake Everett via Wikimedia Commons
Blake Everett via Wikimedia Commons

Violent storms in Northern California have deposited 33.6 billion gallons of water into Lake Tahoe, where the water level has risen by an entire foot since January 1.

The appearance of a 12-inch-high sheet of water would be dramatic in any body of water, but Lake Tahoe is massive, with a surface area of 191 square miles. And over the past six years, it’s been very, very dry.

The downpour has filled lakes and reservoirs across the region. In the last two weeks alone, storms have dumped a combined 1.3 million acre-feet of water into the 154 largest reservoirs in the state. State hydrologists say those reservoirs are currently filled to about 97 percent of their capacity. That's an impressive change from the same date last year, when the ongoing drought left them at or below 50 percent of normal levels.

In some ways the storms were right on time, as experts had begun to worry about regional water supplies. But all extreme weather events—even welcome ones—have their downside. Flooding from surging rivers has forced thousands of residents to evacuate their homes.

Jana Frazier is a tour guide for the Department of Water Resources at Lake Oroville. She says that lake has risen more than 90 feet since December, swelling above the boat ramp and edging into the parking area.

“It’s really weird,” she told the Los Angeles Times. “We’ve been in low water for so long, it seems strange to drive across the dam and see it almost full.”

Officials say it’s still too soon to declare an official end to the drought, but more storms are expected over the coming week.

Denver is About to Experience Summer and Winter Temperatures Within 24 Hours

iStock.com/mphotoi
iStock.com/mphotoi

In a story tailor-made for exhaustive Weather Channel coverage, Denver, Colorado is about to experience one of the more bizarre weather shifts in recent memory. After an expected Tuesday high of 80°F, residents can anticipate a dramatic shift down to 32°F by midday Wednesday, with an initial half-inch of snow accumulation increasing to up to 7 inches by Wednesday night.

Put another way: Citizens who need to make sure they hydrate in the warm temperatures Tuesday will have to bring out the parkas the following day.

The Denver Post reports that the warm air coming ahead of the cold can result in a clash of air masses, prompting areas of low pressure that can create forceful and damaging weather conditions. The storm could bring winds of up to 60 miles per hour and possibly even cause power outages. Snow accumulation should dissipate by the weekend, when temperatures are expected to climb back into the 60s.

The high temperature record for April 9 in Denver is 81°F, set in 1977.

[h/t The Denver Post]

What Is a Bomb Cyclone?

Maddie Meyer/Getty Images
Maddie Meyer/Getty Images

The phrase bomb cyclone has re-entered the news this week as parts of the central U.S. face severe weather. Mountain and Midwestern states, including Colorado, Nebraska, Wyoming, and South Dakota, all fall in the path of a winter storm expected to deliver tornadoes, hail, heavy snow, flooding, and hurricane-force winds on Wednesday, March 13 into Thursday. It seems appropriate for a storm that strong to have bomb in its name, but the word actually refers to a meteorological phenomenon and not the cyclone's explosive intensity.

According to The Denver Post, the bomb in bomb cyclone stands for bombogenesis. Bombogenesis occurs when a non-tropical storm experiences at least a 24 millibar (the unit used to measure barometric pressure) drop within 24 hours. Low pressure makes for intense storms, so a bomb cyclone is a system that's built up a significant amount strength in a short length of time.

This type of storm usually depends on the ocean or another large body of water for its power. During the winter, the relatively warm air coming off the ocean and the cold air above land can collide to create a sharp drop in atmospheric pressure. Also known as a winter hurricane, this effect has produced some of the worst snowstorms to ever hit the U.S.

The fact that this latest bomb cyclone has formed nowhere near the coast makes it even more remarkable. Rather, a warm, subtropical air mass and a cold, Arctic air mass crossed paths, creating the perfect conditions for a rare bombogenesis over the Rockies and Great Plains states.

Central U.S. residents in the bomb cyclone's path have taken great precautions ahead of the storm. Over 1000 flights have been canceled for Wednesday and schools throughout Colorado have closed.

[h/t The Denver Post]

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