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Possible Implications of a Vortex Gas Model and Self-Similarity for Tornadogenesis and Maintenance

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Wednesday, 5 February 2014
Hall C3 (The Georgia World Congress Center )
Douglas P. Dokken, University of St. Thomas, St. Paul, MN; and M. Shvartsman, K. Scholz, P. Belík, C. K. Potvin, B. A. Dahl, and A. McGovern

Handout (2.5 MB)

We describe tornado formation and maintenance using the 3-dimensional vortex gas model of (Chorin 1994). High-energy vortices with negative temperature in the sense of (Onsager 1949) play an important role in the model. We speculate that the formation of high-temperature vortices is related to the helicity inherited as they form or tilt into the vertical. We also exploit the notion of self-similarity to justify power laws derived from observations of weak and strong tornadoes in (Cai 2005; Wurman and Gill 2000; Wurman and Alexander 2005). Analysis of a Bryan Cloud Model (CM1) simulation of a tornadic supercell reveals scaling consistent with the observational studies.

Supplementary URL: http://arxiv.org/abs/1403.0197