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The objective of this research is the study of climate dynamics of the weather types, responsible for the fog genesis at the Air Force Academy airfieldAFA-located in the region of Pirassununga at coordinates 21o59’07” S, 47o20’06” W and the altitude of 600m . The rhythmic analysis methodology proposed by Monteiro(1971) was applied to the period of the highest occurrence of the phenomenon – April, May, June, July during three standard years (usual, exceptionally high occurrence and exceptionally low occurrence). Descriptive statistics of the fog occurrences were held in the first part of this paper as well as the characterization of its temporal distribution over 20 years (1989 to 2008 ). The choice of standard years was made by statistical techniques applied to the period of highest occurrence of the phenomenon. The second part of this paper was based on the rhythmic analysis over the years chosen as the standard for the airfield – 2003 (usual), 2008 (exceptionally high occurrence) and 2005 (exceptionally low occurrence). As a result it was found that types of fog generator weather occurred preferably under the influence of the Atlantic Polar Air Mass. Sequences of different types of weather triggered after the passage of the Atlantic Polar Air Front or the dominance of the Atlantic Polar Air Mass with squall lines also contributed to the genesis of fog occurrences at the local.

Nevoeiro e dinâmica atmosférica: uma contribuição ao estudo sobre ocorrências de nevoeiro no aeródromo da Academia da Força Aérea - Pirassununga/SP