The Annual Course of Zonal Wind Speed at 700 Mb

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  • 1 Extended Forecast Section U. S. Weather Bureau, Washington, D. C.
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The annual course of zonal wind speed at 700 mb for latitudes 20° to 90 °N is portrayed in three ways—from monthly normal data, from monthly mean data averaged over a recent seven year period, and from 5-day mean data averaged over the same seven years. In a broad sense these representations have much in common, but the 5-day data reveal certain well-marked shorter period variations in the westerlies which appear to be related to singularities of the general circulation.

The annual course of zonal wind speed at 700 mb for latitudes 20° to 90 °N is portrayed in three ways—from monthly normal data, from monthly mean data averaged over a recent seven year period, and from 5-day mean data averaged over the same seven years. In a broad sense these representations have much in common, but the 5-day data reveal certain well-marked shorter period variations in the westerlies which appear to be related to singularities of the general circulation.

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