A synthesis of the Elements of Random-Ship Synoptic Reports to Derive Climatological Marine-Fog Frequencies.
NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
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Published climatologies of marine-fog frequencies are in disagreement for common areas, although the nature and magnitude of errors are difficult to assess since actual frequencies for specific locations may be derived only from observations at Ocean Stations. This study presents a method of synthesizing the elements of surface-ship synoptic reports into a computerized scheme for the purpose of deriving frequencies of marine fog occurrence. The program, based on a liberal interpretation of reporting guidelines in the Synoptic Code Manual, uses 16 combinations of present and past weather, and visibility, to identify fog in the reports. The program then objectively assigns the duration of fog for the three- or six-hour period represented by the synoptic report. A prototype climatology of marine-fog occurrence is derived for July, over the eastern North Pacific Ocean. Modified author abstract