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air masses and fronts.notebook
March 04, 2008
Air Masses and Fronts
Air Mass‐‐a large body
of air that has a
characteristic
temperature, pressure,
and humidity.
http://www.met.tamu.edu/class/Metr304/Dir­surface/surface.html
Mar 3­7:30 AM
Mar 3­7:59 AM
Low Pressure Systems
Winds blow TOWARD the center
of the air mass; winds spiral
counter‐clockwise‐‐this is called a
cyclone. Low pressure systems
bring stormy weather.
Mar 3­7:38 AM
Low pressure system
High Pressure systems
Air blows away from the center
of the air mass‐‐winds spiral
clockwise; this is called an
anticyclone. High pressure
systems bring FAIR weather.
Mar 3­7:34 AM
High pressure system
1
air masses and fronts.notebook
Fronts
When air masses of different
temperatures, pressures, or
moisture meet, the boundary is
called a front.
Mar 3­7:43 AM
Cold front
March 04, 2008
Cold Fronts
Cold air overtakes warm
air; warm air rises quickly;
rain, and sometimes severe
storms, form.
Mar 3­7:51 AM
Cold front ­ diagram
Warm Fronts
When warm air overtakes colder
air; usually brings lighter rain
that may last for a long time.
Mar 3­7:54 AM
Warm front
2
air masses and fronts.notebook
Warm front ­ diagram
March 04, 2008
Mar 3­10:51 AM
3
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