- An unique opportunity to investigate wind flow
patterns and calm air patterns arose from the acquisition
of a survey by Clarence L. Smalley on air flow patterns in
the San Francisco Bay area from 1952 through 1955. An
analysis was made of the wind patterns and calms in the study
area and of the factors affecting these patterns. The wind
flow patterns were described and organized into forty-two
patterns. Calm periods were separated into eight groups
based upon persistence. Analysis procedure followed a systematic
approach based on the prevalence of wind flow patterns
and calms on a diurnal and seasonal basis. Variations in
wind flow patterns were observed six hours apart during a day.
The seasonal wind patterns were divided into ninety-eight
periods of fifteen days each. Calm patterns were stratified
into two time periods diurnally, based upon radiosonde information.
Seasonal calm patterns were stratified into six
periods. The results of these stratifications were then
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