Meteorology · Synoptic Charts — Frontal Symbols
On a surface synoptic chart, a front drawn with triangles on one side and semicircles on the other side of the same line represents:
- AAn upper-level trough
- BAn occluded front
- CA squall line
- DA stationary front (cold-front triangles and warm-front semicircles on opposite sides)✓ Correct
Explanation
Chart symbology: solid triangles point in the direction of a cold front's motion; semicircles mark a warm front; alternating triangles and semicircles on the same side mark an occluded front. Triangles and semicircles on opposite sides of one line denote a stationary front.
Authority: WMO frontal analysis symbols; Bowditch (Pub. No. 9)
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