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A line marking air streams meeting and rising.
Also known as: Convergence zone marking, Shear line
A convergence line marks where two air streams meet and air is forced upwards. It is drawn without frontal pips because it need not separate different air masses, and it frequently produces a line of showers on an otherwise quiet chart.
Marks a boundary where surface air streams meet and rise, drawn as a line without frontal symbols.
Contexts: Navigation, Maps
Need not separate air masses of different origin, which is what distinguishes it from a front despite producing similar shower lines.
Contexts: Navigation, Maps
A plain line drawn across a chart, sometimes dashed, carrying no triangles or half circles along its length.