8B.2 Observations from VORTEX2: The genesis and intensification of the Goshen County, Wyoming tornado (05 June 2009)

Tuesday, 27 September 2011: 10:45 AM
Urban Room (William Penn Hotel)
Karen A. Kosiba, Center for Severe Weather Research, Boulder, CO; and J. Wurman, Y. P. Richardson, P. Markowski, and P. Robinson

A dual-Doppler and thermodynamic analysis of the genesis and the intensification of an EF-2 tornado observed on 5 June 2009 in Goshen County, WY during the VORTEX2 field campaign will be presented. Prior to tornadogenesis dual-Doppler analyses revealed the beginning of a wind surge in the rear-flank downdraft. This surge was followed by the development of a secondary gust front located behind the primary rear-flank gust front and adjacent to the developing tornadic circulation. Through trajectory analysis and the integration of mobile mesonet data, the importance of this change in rear-flank downdraft structure and its link to tornadogenesis and tornado intensification will be discussed in the context of vorticity generation and/or transport. Changes in reflectivity structure, including the development of a low reflectivity ribbon, during this time interval also will be examined.
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