SOME ATTEMPTS TO DETERMINE LONG WAVE POSITIONS BY QUANTITATIVE MEANS
CHICAGO UNIV IL
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Methods were evaluated for determining the long-wave pattern. Graphs representing 3-day means of the continuity chart were a valuable aid in determining the long-wave pattern in most cases, but may not be applicable during periods of changing wave number or considerable movement of the long waves. Mean graphs based upon an eccentric grid showed slight improvement over those based upon a fixed latitude belt. A determination and removal of the short-wave pattern to arrive at the long-wave pattern is possible however, the desired results are not obtainable during the periods of appreciable change in the long-wave configuration. The number of short waves discernible by present methods at the 500-mb level is less than the number of low pressure areas. Indications are that either many surface systems apparently have no association with an upper-level wave train, or additional wave trains of small amplitude exist in the atmosphere.