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A line carrying both triangles and semicircles, where a cold front has caught a warm one.
Also known as: Occlusion, Line with triangles and bumps
An occluded front carries both symbols on the same side, which is exactly what it is: a cold front that has overtaken a warm one, so both boundaries now run together.
Marks a front where an advancing cold front has overtaken a warm front, lifting the warm air clear of the surface.
Contexts: Navigation
Alternates triangles and semicircles on the same side of the line, a composition that states directly what the front is made of.
Contexts: Navigation
Is drawn in purple where colour is available, between the blue of a cold front and the red of a warm one.
Contexts: Navigation
A curved line carrying solid triangles and solid semicircles alternately along its length, all on the same side.
The symbol combines both fronts because the weather system does.