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For more details, see the ahats logbook at https://wiki.ucar.edu/display/ahatslogbook
Good wind direction: For the period 7/1 13:00 through 7/2 13:00, we have
13.67 hours of data periods of length 20 minutes or longer with
wind directions from 195-355 degrees. This includes 3 periods of length
greater than one hour and equates to good periods 57% of the time.
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