Synoptic influences on the evolution of a severe hailstorm environment Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3n2042630

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  • Two summertime days were investigated, 27 and 28 June 1973, to observe the changes in the environment that led to the severe hailstorm on 28 June in the National Hail Research Experiment (NHRE) network, Colorado. Within the network thermodynamic analyses revealed the 28th to have: (1) Above-average low-level moisture. (2) Approximately equal heating as on the 27th. (3) A lower stability index in the morning than on the previous morning. (4) A potentially unstable layer at the top of the mixed layer. The small scale and weakness of an eastward-migrating short wave trough suggested application of a perturbation wind analysis, which showed a vortex moving across the country. Divergence computations at upper levels displayed a divergent region downstream of the vortex and convergent region upstream. The ascent associated with this upper-level divergence led to release of the potential instability found on the 28th, resulting in severe convective storms within the NHRE network. Satellite photographs suggest that the short wave trough originated off the Baja California coast, and show the perturbation vortex associated clouds to move across the U.S. in good agreement with estimated locations of the divergence maximum.
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