Low Pressure System

A Low Pressure System is an area of low relative atmospheric pressure that contains convergent (outward flowing) winds and spins the same direction as the earth – counterclockwise in the Northern hemisphere, clockwise in the Southern hemisphere.

High Pressure System

A High Pressure System is an area of high relative atmospheric pressure that spins in the direction opposite of the Earth’s rotation (clockwise in the Northern Hemisphere, counterclockwise in the Southern Hemisphere) and contains divergent (inward flowing) winds.