Persistence of light surface winds in Canada

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Abstract
The persistence of light surface winds (less than or equal to 3 m s−1 or 7 mi h−1) is one meteorological factor in air pollution potential. Surface wind data were obtained from 111 Canadian synoptic and aviation weather stations for the period 1957–66. Generally speaking, persistent light winds occur most frequently in British Columbia, the Yukon and northern Alberta. In the ten provinces of Canada, the frequency of occurrence of light winds is a minimum in the spring and a maximum in the winter. In the Yukon and the Northwest Territories it is a minimum in the summer and a maximum in the winter. The seasonal variation is least in the mountain valleys and greatest elsewhere. The spatial and seasonal variations in persistent light winds suggest that, in the mountain valleys, topography is the major factor, while in other regions synoptic weather patterns are relatively important.

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