SOME EMPIRICAL CHARACTERISTICS OF LONG WAVES ON MONTHLY MEAN CHARTS

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  • 1 Extended Forecast Section, U. S. Weather Bureau, Washington, D. C.
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Abstract

The geographical frequency of ridges and troughs appearing on 30-day mean 700-mb. charts in the North American area during the past 20 winters is described as a useful supplement to the normal chart. Statistics pertaining to the dimensions, symmetry, and motion of planetary waves on these charts are summarized by use of graphical correlation and synoptic models. The results throw light on the structure of the centers of action in the atmosphere and indicate their interdependence.

Abstract

The geographical frequency of ridges and troughs appearing on 30-day mean 700-mb. charts in the North American area during the past 20 winters is described as a useful supplement to the normal chart. Statistics pertaining to the dimensions, symmetry, and motion of planetary waves on these charts are summarized by use of graphical correlation and synoptic models. The results throw light on the structure of the centers of action in the atmosphere and indicate their interdependence.

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