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Notes: Fronts and Air Pressure Systems
Transcript of Notes: Fronts and Air Pressure Systems
Warm and moist air is present before a cold front comes in and move the warm, less dense air up.
Weather before a cold front...
The weather conditions before a warm front are usually cool and dry air
Weather before a warm front...
What is a front?
The area where two air masses collide.
Weather after a cold front...
Cold air forces warm air upwards, forming towering clouds. As a result, there are brief but severe thunderstorms. After the storm passes, the air is cold and dry.
Weather after a warm front...
The cold air forces the warm air to rise. As it rises, it cools and the moisture in the air condenses, changing from water vapor to liquid water. The result is precipitation that can last up to 12 - 24 hours and is then followed by warm and humid air.
What is air pressure?
A measure of the force that air exerts on the surface
High Pressure System
About a High Pressure System:
A high pressure system is a whirling mass of cool, dry air that generally brings fair weather and light winds.
When viewed 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.
Low Pressure System
About a Low
A low pressure system is a whirling mass of warm, moist air that generally brings stormy weather with strong winds.
When viewed from above, winds spiral into a low-pressure center in a counterclockwise rotation in the Northern Hemisphere.
A low pressure system is represented as a big, red L.