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Denver Convergence Vorticity Zone
The Denver Convergence Vorticity Zone (DCVZ) is an orographically-induced atmospheric phenomenon characterized by convergent winds east of the Denver metropolitan area, typically 50 to 100 km in length and oriented in a north-south direction. This meteorological feature was subject to academic scrutiny following a large outbreak of Denver-area tornadoes in 1981 and has been used to explain the propensity of the area to spawn landspout (misocyclone) and supercell (mesocyclone) tornadoes. The DCVZ is often associated with the Denver Cyclone effect, although the Denver Cyclone is considered a distinct atmospheric phenomenon by some scientists.〔Pietrycha, A. Email correspondence quoted by Sam Barricklow, http://www.k5kj.net/DCVZ.htm〕
== Characteristics ==
DCVZ conditions form when a low-level moist, southeasterly flowing air mass meets the Palmer Divide, a ridge that extends east of the Colorado Front Range. If the moist air lifts over the ridge and meets northwesterly winds originating in the Rocky Mountain foothills, winds may converge to create enhanced cyclonic vorticity.〔 A study conducted between 1981 and 1989 demonstrated that the DCVZ formed on one-third of all days during the convective season (May through August).〔Szoke, E.J., and J.A. Augustine, 1990: An examination of the mean flow and thermodynamic characteristics of a mesoscale flow feature: The Denver Cyclone. Fourth Conference on Metroscale Processes, Boulder, American Meteorological Society〕
DCVZ conditions are often associated with the Denver Cyclone effect, which is characterized by the formation of a large gyre near the city center.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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