Cool, Dry Air That Generally Brings Fair Weather And

What is a High Pressure System?
A high pressure system is a whirling mass of :

cool, dry air that generally brings fair weather and

light winds. From above, winds spiral out of a high-pressure center

in a clockwise rotation in the Northern Hemisphere.

These bring sunny skies.

A high pressure system is represented as a big, blue H
What is a Low Pressure System?
A low pressure system is a whirling mass of:

warm, moist air that generally brings unsettled weather with

strong winds. From above, winds spiral into a low-pressure center in a counterclockwise rotation in the Northern Hemisphere.

This usually means precipitation of some sort depending on temp

A low pressure system is represented as a big, red L

What is a front? http://www.phschool.com/atschool/phsciexp/active_art/weather_fronts/

A front is a boundary between two different air masses.

A cold front:A boundary between two air masses, cold and warm, where the colder air replaces the warmer air, represented as a blue line with teeth pointing to the direction of movement.

A warm front:A boundary between two air masses, cool and warm, where the warmer air replaces the cooler air, represented as a red line with half circles pointing to the direction of movement.

http://www.phschool.com/atschool/phsciexp/active_art/weather_fronts/