Environmental Science 102
Weather Systems: Fronts and Cyclones
Air moves from high pressure to low pressure.
Air will continue to move until the pressures are equal.
The greater the pressure gradient (i.e. the greater the difference between two location's pressures) the greater the force of wind.
Major Global Wind Belts
Subtropical High Pressure Belt
Intertropical Convergence Zone (ITC)
Apparent force which causes free moving objects to appear to be deflected from its path of motion.
Cause by the rotation of the Earth
Low Pressure Centers
High Pressure Centers
Air Moves outward
Replaced by descending air
What happens to this air as it descends?
Air moves inward
Converging, rising air
What happens to this air as it rises?
Wave Cyclone - forms along the Polar Front in the mid- and high-latitudes.
Cold air mass moving into a zone occupied by a warm air mass
Warm air mass moving into a zone occupied by a cold air mass
Cold Front overtakes a Warm Front
Two Types of Occluded Front
Dry air (cT) converges with moist air (mT).
Formation of a Wave Cyclone
Two large anticyclones from along the Polar Front
A low pressure trough develops between them where the winds converge.
Stationary Front forms
Low Pressure center develops.
Rotation causes the Cold Front to begin to move around the low pressure.
Cold Front overtakes the Warm Front.
Occluded Front forms.
Occluded Front breaks down.