"Occasional"@en . "The term \"occasional\" refers to clouds or weather phenomena which cover between 1/8 and 1/2 of a given area. Less coverage is considered \"isolated\", whereas more is considered \"frequent\"."@en . . "The term \"occasional\" refers to clouds or weather phenomena which cover between 1/8 and 1/2 of a given area. Less coverage is considered \"isolated\", whereas more is considered \"frequent\"."@en .