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Weather Fronts. October 24, 2012. High Pressure. cool air gets denser – moves toward the ground pressure increases because more air fills the space pressure in that area is greater than the area surrounding it sunny, dry, and cooler than normal. . H. Low Pressure.

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Weather fronts

Weather Fronts

October 24, 2012


High pressure
High Pressure

cool air gets denser – moves toward the ground

pressure increases because more air fills the space

pressure in that area is greater than the area surrounding it

sunny, dry, and cooler than normal.

H


Low pressure
Low Pressure

the air is warmed – gets less dense and moves up higher

cloudy, wet, warm, and windy.

L


Air mass
Air Mass

a body of air extending hundreds or thousands of miles sideways and sometimes as high as the stratosphere and having nearly the same conditions of temperature and humidity at any single level.


Front
Front

boundaries between two air masses that differ in temperature and humidity.


Warm front
Warm Front

an advancing edge of a warm air mass


Cold front
Cold Front

an advancing edge of a cold air mass


Stationary front
Stationary Front

a front between warm and cold air masses that is moving very slowly or not at all.


Occluded front
Occluded Front

the front formed by a cold front overtaking a warm front and lifting the warm air over the cold air 

Two types:

Cold occlusion – when the coldest air is behind the cold front

Warm occlusion – when the coldest air is ahead of the warm front.


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