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For more details, see the ahats logbook at https://wiki.ucar.edu/display/ahatslogbook
Good wind direction: For the period 6/25 17:00 through 7/7 13:00, we have
121.17 hours of data periods of length 20 minutes or longer with
wind directions from 295-355 degrees. This includes 92.67 hours of periods
longer than one hour and equates to good wind direction periods 43%
of the time. Sorted by stability, there are 61.08 hours of stable
stratification (<w'tc'> < 0) and 58.67 hours of unstable stratification.
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