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    Vertical Wind Shear Associated with Left-Moving Supercells

    Source: Weather and Forecasting:;2002:;volume( 017 ):;issue: 004::page 845
    Author:
    Bunkers, Matthew J.
    DOI: 10.1175/1520-0434(2002)017<0845:VWSAWL>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Vertical wind shear parameters are presented for 60 left-moving supercells across the United States, 53 of which produced severe hail (≥1.9 cm). Hodographs corresponding to environments of left-moving supercells have a tendency to be more linear than those of their right-moving supercell counterparts. When curvature is present in the hodographs of the left-moving supercells, it is typically confined to the lowest 0.5?1 km. Values of 0?6-km wind shear for left-moving supercells?both bulk and cumulative?are within the ranges commonly found in right-moving supercell environments, but the shear values do occur toward the lower end of the spectrum. Conversely, the absolute values of storm-relative helicity (SRH) for left-moving supercells are much smaller, on average, than what occur for right-moving supercells (although SRH values for many right-moving supercells also fall well below general guidelines for mesocyclone development). A significant fraction of the 0?3-km SRH (25%) and 0?1-km SRH (65%) for left-moving supercells is positive, owing to the shallow clockwise curvature of the hodographs. However, nearly all of the 1?3-km SRH for left-moving supercells is negative, with absolute values comparable in magnitude to those for right-moving supercells. A limited climatological analysis of vertical wind shear associated with convective environments across parts of the central United States suggests that clockwise curvature of the low-level shear vector is most common in the central/southern plains, partially explaining the preeminence of right-moving supercells in that area. In contrast, hodographs are more linear over the northern high plains, suggesting left-moving supercells may be relatively more common there. It would be beneficial to implement operational radar algorithms that can detect mesoanticyclones across the United States.
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      Vertical Wind Shear Associated with Left-Moving Supercells

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    contributor authorBunkers, Matthew J.
    date accessioned2017-06-09T15:02:12Z
    date available2017-06-09T15:02:12Z
    date copyright2002/08/01
    date issued2002
    identifier issn0882-8156
    identifier otherams-3269.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4170278
    description abstractVertical wind shear parameters are presented for 60 left-moving supercells across the United States, 53 of which produced severe hail (≥1.9 cm). Hodographs corresponding to environments of left-moving supercells have a tendency to be more linear than those of their right-moving supercell counterparts. When curvature is present in the hodographs of the left-moving supercells, it is typically confined to the lowest 0.5?1 km. Values of 0?6-km wind shear for left-moving supercells?both bulk and cumulative?are within the ranges commonly found in right-moving supercell environments, but the shear values do occur toward the lower end of the spectrum. Conversely, the absolute values of storm-relative helicity (SRH) for left-moving supercells are much smaller, on average, than what occur for right-moving supercells (although SRH values for many right-moving supercells also fall well below general guidelines for mesocyclone development). A significant fraction of the 0?3-km SRH (25%) and 0?1-km SRH (65%) for left-moving supercells is positive, owing to the shallow clockwise curvature of the hodographs. However, nearly all of the 1?3-km SRH for left-moving supercells is negative, with absolute values comparable in magnitude to those for right-moving supercells. A limited climatological analysis of vertical wind shear associated with convective environments across parts of the central United States suggests that clockwise curvature of the low-level shear vector is most common in the central/southern plains, partially explaining the preeminence of right-moving supercells in that area. In contrast, hodographs are more linear over the northern high plains, suggesting left-moving supercells may be relatively more common there. It would be beneficial to implement operational radar algorithms that can detect mesoanticyclones across the United States.
    publisherAmerican Meteorological Society
    titleVertical Wind Shear Associated with Left-Moving Supercells
    typeJournal Paper
    journal volume17
    journal issue4
    journal titleWeather and Forecasting
    identifier doi10.1175/1520-0434(2002)017<0845:VWSAWL>2.0.CO;2
    journal fristpage845
    journal lastpage855
    treeWeather and Forecasting:;2002:;volume( 017 ):;issue: 004
    contenttypeFulltext
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian