Chapter 13 — CIRCULATION OF THE ATMOSPHERE 



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 Figure 13-13. —Valley or anabatic wind. During the daytime hillsides heat quickly. This heating effect 

 causes updrafts along upslopes — downdrafts in the center. 



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 Figure 13-14. — Mountain or katabatic wind. During the night outgoing radiation cools air along hill- 

 sides below free air temperature. The cooled air drains to lowest point of the terrain. 



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