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- W3210292224 abstract "Abstract Long-lived supercells (containing mesocyclones persisting for at least 4 hours) are relatively rare, but present significant risk for society as a result of their intensity and associated hazards over an extended time period. The persistence of a rotating updraft is tied to near-storm environmental characteristics; however, given the established prevalence of mesoscale environmental heterogeneity near severe convection, it is unknown to what extent those near-storm characteristics vary over the lifetime of a supercell, nor how quickly the storm responds to such changes. This study examines 147 long-lived, isolated supercells, focusing on the evolution of their near-storm environments using model analysis soundings generated each hour throughout the storm’s lifetime. Environmental variability is quantified via a series of common forecasting parameters, with impacts of measured changes related to production of severe weather and overall storm longevity. The diurnal and maturity-relative distributions of forecasting parameters are examined, along with comparisons among subsets of marginally vs. very long-lived supercells, as well as dissipation before vs. after sunset. The diurnal cycle is a dominant trend over the lifetime of all supercells, with attendant impacts to relevant thermodynamic and kinematic parameters, timing of storm initiation and dissipation, as well as severe weather production. Notably, changes in the near-storm environment are connected to supercell longevity and generation of severe weather reports. The long-term goal of the above analyses is to enhance short-term forecasts of supercells by better anticipating storm evolution as a result of environmental variations." @default.
- W3210292224 created "2021-11-08" @default.
- W3210292224 creator A5068117165 @default.
- W3210292224 date "2021-10-25" @default.
- W3210292224 modified "2023-10-17" @default.
- W3210292224 title "Environmental Evolution of Long-Lived Supercell Thunderstorms in the Great Plains" @default.
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- W3210292224 doi "https://doi.org/10.1175/waf-d-21-0042.1" @default.
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