The Washoe Zephyr is a seasonal diurnal wind which occurs across western

Nevada Nevada ( ; ) is a U.S. state, state in the Western United States, Western region of the United States. It is bordered by Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. N ...

just east of the

Sierra Nevada The Sierra Nevada () is a mountain range in the Western United States, between the Central Valley of California and the Great Basin. The vast majority of the range lies in the state of California, although the Carson Range spur lies primarily ...

mountains. It blows primarily in the summer from mid afternoon until late in the evening from the west to southwest, becoming quite gusty. As the terrain is generally arid, the Washoe Zephyr typically lifts a considerable quantity of dust into the atmosphere. The Washoe Zephyr runs contrary to the usual pattern of diurnal mountain slope winds (upslope daytime, downslope nighttime) and thus its exact mechanism is still being studied. One hypothesis is that the wind is caused by intense heating over the Great Basin during summer afternoons. The heating causes a

thermal low Thermal lows, or heat lows, are non-frontal low-pressure areas that occur over the continents in the subtropics during the warm season, as the result of intense heating when compared to their surrounding environments.Glossary of Meteorology (200 ...

to develop which sets up a pressure gradient which induces the wind, pulling cooler air down from the High Sierra. The Washoe Zephyr first gained notoriety from a passage written by

Mark Twain Samuel Langhorne Clemens (November 30, 1835 – April 21, 1910), known by his pen name Mark Twain, was an American writer, humorist, entrepreneur, publisher, and lecturer. He was praised as the "greatest humorist the United States has p ...

in his 1872 book ''

Roughing It ''Roughing It'' is a book of semi-autobiographical travel literature by Mark Twain. It was written in 1870–71 and published in 1872, as a prequel to his first travel book ''The Innocents Abroad'' (1869). ''Roughing It'' is dedicated to Twa ...

''. The wind played a role in a large fire which Twain claimed to have accidentally set. This same wind may have played a key role in the

Angora Fire The Angora Fire was a 2007 wind-driven wildfire in El Dorado County, California. It started near North Upper Truckee Road subdivision near Angora Lakes, Fallen Leaf Lake, Echo Lake and South Lake Tahoe, California around 2:15 PM on Sund ...

of June 2007. It may also have played a role in the disappearance of millionaire flier

Steve Fossett James Stephen Fossett (April 22, 1944 – September 3, 2007) was an American businessman and a record-setting aviator, sailor, and adventurer. He was the first person to fly solo nonstop around the world in a balloon and in a fixed-wing aircraf ...

in September 2007.Pilots: Winds bad where Fossett flew—NBC news
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References

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External links

Geography of Nevada Winds