Calculations are carried out to determine the preferred contour heights at which fronts are found on upper isobaric charts, assuming the validity of a three-frontal model and of certain characteristic air-mass temperatures. In view of their proximity to fronts aloft, the axes of upper wind maxima should also demonstrate an association with preferred contour heights. Fletcher [1] has shown statistically that such is the case and his figures agree well with the calculated heights.

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* Published by permission of the Controller, Meteorological Division, Department of Transport, Canada.