Weather Fronts and Pressure Centers

Weather fronts appear as lines that indicate the leading edge of an air mass.

Front Symbol

Description

Cold front

Cold front

Warm front

Warm front

Stationary front

Stationary front

Occluded front

Occluded front

Trough

Trough

Pressure-center symbols often appear near weather fronts.

Pressure-Center Symbol

Description

Low-pressure center symbol

Indicates a low-pressure center, which is a region of relatively lower pressure. Moving away from a low-pressure center results in increased pressure. Winds flow counterclockwise around low-pressure centers in the northern hemisphere.

High-pressure center symbol

Indicates a high-pressure center, which is a region of relatively higher pressure. Moving away from a high-pressure center results in decreased pressure. Winds flow clockwise around high-pressure centers in the northern hemisphere.

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