Radiosonde-wind data at 100 mb and 50 mb over the U. S. in 1952 are presented in the form of month-by-month frequency distributions of westerly and easterly winds. These data show that the 50 mb circulation in the month of February differed markedly from the expected pattern.
In Volume I, the theory of large-scale atmospheric diffusion is developed. The application of this theory to air trajectories is presented in Volumes II and III. Volume II contains probability tables for various constant values of mean zonal wind. Volume III consists of probability tables for North America and Eurasia. ACKNOWLEDGEMENT The authors wish to express their sincere appreciation to Messrs. Robert E. Chabot and Joseph Hess who performed the laborious hand caiculations required to prepare the basic data for niachine computation. L !.I" ,q * tioit detxi s i tt-h~ probability dtitnuty w ith respovt to aidtucie 0 of i 1an !-.a wt~st dia&3)la i Ceet at leadt A s large as a spotcified value, occurrinig P1q-1'tvd inl Vo iuniv It alid Ill for (it) Various constalit Values of keanw and (hi) North Anirieca anid 1 :.ia
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