Abstract: A three-dimensional picture of the horizontal velocity divergence is constructed at seven times, at twelve-hour intervals, with use of observed winds as a basis for divergence computations. No level of non-divergence is ...

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Abstract: The three-dimensional distribution of relative vorticity in the lower 25,000 feet of the atmosphere, and over a three-day period of time, is presented and discussed. Absolute-vorticity centers are advected at seven levels ...