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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/