Download What is a High Pressure System?

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/