Transcript Atmospheric Movement

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*When convection and winds cause air
masses to move, they bump into one
another.
*The area where two air masses meet is
called a front.
*Most severe weather occurs near frontal
boundaries.
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Cold air moves in the direction
triangles are pointing
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Warm front moves in direction the
bubbles “point”
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*Warm and cool air masses that are
not strong enough to move one
another
*Sits still for a long period of time
*Often brings long periods of
precipitation and clouds
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http://www.phschool.com/atschool/phsciexp/acti
ve_art/weather_fronts/
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*Air pressure measured with a barometer
*Unit is millibars
*Millibars represented by connected lines of equal
pressure. This is a lot like the topographic map lines.
*The closer together the lines are, the faster the wind
speed.
*The farther apart the lines are, the slower the wind
speed.
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*Cooler, dense air close to the surface of the
Earth
*Surrounded by winds flowing in a clockwise
direction
*Usually brings dry conditions and fair skies
* Moves toward Low Pressure
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Warmer, less dense air above the Earth’s surface
Surrounded by winds moving in a counterclockwise
direction.
Associated with the formation of storms.
High pressure moves toward low pressure
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*The Sun heats the water and land every day.
*Land heats up rapidly, but cools off rapidly.
*Desert
*Water heats up slowly, but cools off slowly.
*Swimming at night
*The heat retained by the oceans is what keeps our
planet insulated.
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*The heating and cooling of water and land
produces land breezes and sea breezes.
*High pressure moves toward low pressure,
pushing the warm air upward.
*As warm air rises, cooler air moves in and
replaces it.
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* http://www.youtube.com/watch?v=prasiYDxA6g
* Uses of anemometers
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http://www.classzone.com/books/earth_science
/terc/content/visualizations/es1903/es1903pag
e01.cfm?chapter_no=visualization
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