XM Satellite Radio GXM30 - Manual (Page 21)

GXM 30 XM Radio Smart Antenna Owner’s Manual 15
Fronts
The Fronts feature displays lines indicating the leading edge of an air mass. 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.
Cold Front
Warm Front
Stationary Front
Occluded Front
Trough
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.
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