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EATHER

EATURES

ATMOSPHERE

Fronts

The Fronts feature displays the lines indicating the leading edge of an air mass that is replacing another. This feature also displays pressure centers. Pressure centers are

represented by a large Red "L" for low pressure centers or a large Blue "H" for high pressure centers. Pressure centers represent an area where pressure is measured to

be either the highest or lowest relative to the surrounding area.

Indicates a Low Pressure Center. A Low

Pressure Center is an area where the

measured pressure is lowest relative to the

surrounding area. Moving away from a Low

Pressure Center in any horizontal direction

results in increased pressure. Winds ﬂow

counterclockwise around Low Pressure

Centers in North America.

Indicates a High Pressure Center. Similar

to a Low Pressure Center, a High Pressure

Center is an area where the measured pressure

is highest relative to the surrounding area.

Moving away from a High Pressure Center in

any horizontal direction results in decreased

pressure. Winds ﬂow clockwise around Low

Pressure Centers in North America.

FRONTS

Cold Front

Warm Front

Stationary Front

Occluded Front

Dry Line

GDL 30/30A Owner's Manual