文章基本信息

标题：Investigation of stability characteristics of thundersnow events utilizing the growth rate parameter.
作者：Singer, Marc
期刊名称：Transactions of the Missouri Academy of Science
印刷版ISSN：0544-540X
出版年度：2005
期号：January
语种：English
出版社：Missouri Academy of Science
摘要：Stability characteristics of thunder snow events across the central United States were examined in order to provide more insight into how the environment becomes destabilized over a relatively short period of time. For this purpose, calculations of a growth rate parameter ([[sigma].sup.2]) are performed for seven archived case studies during the 2003-04 winter season utilizing numerical weather model output from the 40-km RUC. Results from this stability tendency revealed that the doubling time for the convection was upon the order of 2.4 hours, which was consistent with the typical timescale for moist slantwise convection released from conditional symmetric instability. In addition, the development of mesoscale snowbands was correctly predicted with the associated computed values for [[sigma].sup.2] easily surpassing the 0.2 h-2 criterion. One rather intense case study will be provided in order to illustrate the usefulness of this method in an operational environment, with a term-by-term diagnosis of the mathematical expression also presented.
关键词：Snowstorms

Investigation of stability characteristics of thundersnow events utilizing the growth rate parameter.

Singer, Marc

Stability characteristics of thunder snow events across the central United States were examined in order to provide more insight into how the environment becomes destabilized over a relatively short period of time. For this purpose, calculations of a growth rate parameter ([[sigma].sup.2]) are performed for seven archived case studies during the 2003-04 winter season utilizing numerical weather model output from the 40-km RUC. Results from this stability tendency revealed that the doubling time for the convection was upon the order of 2.4 hours, which was consistent with the typical timescale for moist slantwise convection released from conditional symmetric instability. In addition, the development of mesoscale snowbands was correctly predicted with the associated computed values for [[sigma].sup.2] easily surpassing the 0.2 h-2 criterion. One rather intense case study will be provided in order to illustrate the usefulness of this method in an operational environment, with a term-by-term diagnosis of the mathematical expression also presented.

* Melick, C.J., L.L. Smith, P.S. Market and B.P. Pettegrew. Department of Soil, Environmental, and Atmospheric Sciences, University of Missouri-Columbia.