Download Lesson 4

lesson4.notebook
February 11, 2014
Review from last class:
­ the water cycle
­ solar radiation distribution
­ albedo of material
Feb 17­2:02 PM
Discuss Clouds:
­ what do we know about clouds?
­ how would you describe clouds?
­ what do clouds usually mean?
Feb 17­1:59 PM
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lesson4.notebook
February 11, 2014
Categories of Clouds:
(a) Convective clouds:
­ form as a result of evaporation of water which rises into the atmosphere as air near the earth's surface is heated
­ as the air rises it expands and cools at which point the condensed air forms convective clouds
(b) Frontal clouds:
­ formed when a warm air mass meets a cooler air mass
­ as the warm air rises above the cool air mass the warm air condenses to form clouds
Feb 17­2:03 PM
(c) Orographic clouds
­ form when air moves up a mountain
­ the air expands because of lower pressure and cools resulting in moisture in the rising air condensing and forming clouds
(d) Fog
­ a cloud usually formed at or near ground level
­ usually formed when warm air moves over cold land masses and the warm air condenses forming fog
Feb 17­2:06 PM
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lesson4.notebook
February 11, 2014
Cloud Classification
(a) Stratus Clouds
­ generally long and flat
­ stratus clouds usually mean stable weather conditions or at worst overcast conditions
(b) Cumulus Clouds
­ have a billowing round shape
­ usually indicate unstable weather
­ clouds tend to grow vertically
(c) Cirrus Clouds
­
thin wispy clouds made of ice crystals
­
usually found at higher levels in the atmosphere
NOTE: Learn Figure 7 page 533 which gives a complete explanation of the 10 main classifications of clouds
Feb 17­2:09 PM
Name that cloud: (Use page 533)
(a) Cirrus or Stratus
Feb 17­2:15 PM
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lesson4.notebook
February 11, 2014
(b) Cirrus or cumulus
Feb 17­2:19 PM
(c) Cirrus or altostratus
Feb 17­2:22 PM
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lesson4.notebook
February 11, 2014
See cloud slideshow:
Readings: page 522 ­ 527
Questions: ­ page 534 #'s 1,3,4,5,8
Feb 17­2:29 PM
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