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Air masses and fronts

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Lee Kimmich

on 19 April 2010

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Transcript of Air masses and fronts

Air masses and Fronts Weather is constantly changing. This happens becuase
different air masses interact with each other to produce
different types of weather. AIR MASS: A large body of air where temperature and moisture content are constant throughout. Air masses are characterized
by their moisture content and temperature. The moisture content and temperature
of an air mass are determined by the
area over which the air mass forms. This area is called a source region. An example of a source region would be the
Gulf of Mexico. Which produces WARM, WET air masses. What would be an example of another source region?? The characteristics of air masses are represented by a two letter symbol.

The first letter represents the moisture content of the air mass.
The second letter represents the temperature. There are 6 different types of air masses that affect weather in North America. FRONTS There are four basic types of fronts:
A cold front forms when cold air moves under warm air.
A cold front pushes warm air out of the way.
Cold fronts bring: Rain, snow, or thunderstorms
Cooler, dry air follows a cold front. WARM FRONTS:
A warm front forms when warm air moves over cold air and replaces it.
Warm fronts bring drizzly rain with good weather to follow. Occluded Fronts
Forms when a warm air mass is trapped between two cold air masses.
Occluded fronts bring cool temperatures and large amounts of rain or snow.
Stationary Fronts
Forms when a cold air mass meets a warm air mass and do not move.
A stationary front brings days of cloudy wet weather.
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