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Chapter 25
Chapter 25
 The general name for a large body of air
having uniform temperature and moisture
content is called an air mass.
 During the summer continental tropical air
masses flow over North America.
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 There are 4 types of air masses
 Continental Polar (cP) form over land that is
covered by ice and snow. They bring cool
or cold weather but it is usually dry.
 Continental Tropical (cT) form over deserts
and usually bring clear, dry, and hot
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 Maritime Polar (mP) form over the Northern
and Southern Oceans with cool water. They
usually bring snow in the winter.
 Maritime Tropical (mT) form over warm
waters of the oceans. They usually bring
heavy rain and thunderstorms.
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 Lightning causes a rapid expansion and
collapse of the air that produces thunder.
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 Cold fronts are shown with
only triangles
 Warm fronts are shown
With only half circles
 Occluded fronts have alternating triangles
and half circles on the same side
 Stationary fronts have alternating triangles
and half circles on opposite sides
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 During the summers, air masses that form
over the southwestern United States usually
bring weather that is hot and clear.
 Warm fronts generally have a gradual slope
and produce heavy precipitation over large
 Warm fronts form when a warm air mass
overtakes a cold air mass.
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 Tornados are short lived storms that have
the highest wind speeds of any storm
 Hurricanes are the largest storms that have
the most energy of any storm
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 Wind vanes measures wind direction.
 Satellite images made using infrared energy
primarily reveal information about
atmospheric temperatures
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 A liquid thermometer is shown in this
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 Satellites carry mounted cameras designed
to photograph the tops of clouds in the
uppermost layers of the atmosphere.
 A barometer is used to measure air
 Thermographs are used to measure
temperature changes.