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    Effective Storm-Relative Helicity and Bulk Shear in Supercell Thunderstorm Environments

    Source: Weather and Forecasting:;2007:;volume( 022 ):;issue: 001::page 102
    Author:
    Thompson, Richard L.
    ,
    Mead, Corey M.
    ,
    Edwards, Roger
    DOI: 10.1175/WAF969.1
    Publisher: American Meteorological Society
    Abstract: A sample of 1185 Rapid Update Cycle (RUC) model analysis (0 h) proximity soundings, within 40 km and 30 min of radar-identified discrete storms, was categorized by several storm types: significantly tornadic supercells (F2 or greater damage), weakly tornadic supercells (F0?F1 damage), nontornadic supercells, elevated right-moving supercells, storms with marginal supercell characteristics, and nonsupercells. These proximity soundings served as the basis for calculations of storm-relative helicity and bulk shear intended to apply across a broad spectrum of thunderstorm types. An effective storm inflow layer was defined in terms of minimum constraints on lifted parcel CAPE and convective inhibition (CIN). Sixteen CAPE and CIN constraint combinations were examined, and the smallest CAPE (25 and 100 J kg?1) and largest CIN (?250 J kg?1) constraints provided the greatest probability of detecting an effective inflow layer within an 835-supercell subset of the proximity soundings. Effective storm-relative helicity (ESRH) calculations were based on the upper and lower bounds of the effective inflow layer. By confining the SRH calculation to the effective inflow layer, ESRH values can be compared consistently across a wide range of storm environments, including storms rooted above the ground. Similarly, the effective bulk shear (EBS) was defined in terms of the vertical shear through a percentage of the ?storm depth,? as defined by the vertical distance from the effective inflow base to the equilibrium level associated with the most unstable parcel (maximum ?e value) in the lowest 300 hPa. ESRH and EBS discriminate strongly between various storm types, and between supercells and nonsupercells, respectively.
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      Effective Storm-Relative Helicity and Bulk Shear in Supercell Thunderstorm Environments

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4231350
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    contributor authorThompson, Richard L.
    contributor authorMead, Corey M.
    contributor authorEdwards, Roger
    date accessioned2017-06-09T17:35:17Z
    date available2017-06-09T17:35:17Z
    date copyright2007/02/01
    date issued2007
    identifier issn0882-8156
    identifier otherams-87657.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4231350
    description abstractA sample of 1185 Rapid Update Cycle (RUC) model analysis (0 h) proximity soundings, within 40 km and 30 min of radar-identified discrete storms, was categorized by several storm types: significantly tornadic supercells (F2 or greater damage), weakly tornadic supercells (F0?F1 damage), nontornadic supercells, elevated right-moving supercells, storms with marginal supercell characteristics, and nonsupercells. These proximity soundings served as the basis for calculations of storm-relative helicity and bulk shear intended to apply across a broad spectrum of thunderstorm types. An effective storm inflow layer was defined in terms of minimum constraints on lifted parcel CAPE and convective inhibition (CIN). Sixteen CAPE and CIN constraint combinations were examined, and the smallest CAPE (25 and 100 J kg?1) and largest CIN (?250 J kg?1) constraints provided the greatest probability of detecting an effective inflow layer within an 835-supercell subset of the proximity soundings. Effective storm-relative helicity (ESRH) calculations were based on the upper and lower bounds of the effective inflow layer. By confining the SRH calculation to the effective inflow layer, ESRH values can be compared consistently across a wide range of storm environments, including storms rooted above the ground. Similarly, the effective bulk shear (EBS) was defined in terms of the vertical shear through a percentage of the ?storm depth,? as defined by the vertical distance from the effective inflow base to the equilibrium level associated with the most unstable parcel (maximum ?e value) in the lowest 300 hPa. ESRH and EBS discriminate strongly between various storm types, and between supercells and nonsupercells, respectively.
    publisherAmerican Meteorological Society
    titleEffective Storm-Relative Helicity and Bulk Shear in Supercell Thunderstorm Environments
    typeJournal Paper
    journal volume22
    journal issue1
    journal titleWeather and Forecasting
    identifier doi10.1175/WAF969.1
    journal fristpage102
    journal lastpage115
    treeWeather and Forecasting:;2007:;volume( 022 ):;issue: 001
    contenttypeFulltext
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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