They face the direction in which the cold air is advancing.
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The triangles on a cold front weather symbol face towards the direction in which the cold air mass is moving, indicating the boundary where cold air is displacing warmer air. This convention helps meteorologists visually represent the movement and characteristics of the front.
On a weather map, the symbol for a cold front is a blue line with blue triangles facing the direction that the front is moving.
The symbol for a warm front is a line with semicircles pointing in the direction of movement. The symbol for a cold front is a line with triangles pointing in the direction of movement.
The blue triangles of a cold front on a weather map point in the direction of movement of the cold air mass displacing the warmer air mass ahead of it. This movement can bring cooler temperatures, precipitation, and changes in weather conditions as the front passes through an area.
You can determine the direction of movement of a cold front based on the direction the cold air is advancing towards warmer air. For warm fronts, you can observe the direction in which the warm air is pushing against the colder air ahead of it. The symbols and shapes on weather maps also indicate the front's movement direction.
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