Unformatted text preview: FOURTH TOPIC: SURFACE WINDS AND VERTICAL MOTION
Vertical motion (rising or sinking air) is avery important factor in determining what kind of
weather we experience. For example, air is needed for clouds and precipitation to form. Let’s see how surface winds are related to vertical motion. The orizontal movement of air (wind) can result in g :0 WV QX 9&23 L or
Cil V22“? 1mg, . Areas of convergence are areas of t (\F Areas of divergence are areas of [ﬁt 3 m4 . Important Note: Convergence and divergence can occur in the upper atmosphere but we
are only focusing on convergence and divergence at the surface of the earth in this topic. Conver ence Deﬁne: the net horizontal i y E if )5 g; of air into an area.
Results in an [H ANS MEI ms [HQW . s i .
Low pressure centers and low pressure troughs are areas of l ‘3 3! NE Sgﬂ LE. ‘15 < LVESWJE’B. C‘— Y taupe (My)
Divergence Deﬁne: the net horizontal 31 L S F] QUQ of air away from an area.
Res‘iiltsin g giUWi 3Wf1 ES LEE; “5 1 which can also be called High pressure centers and high pressure ridges are areas of ( 'ii U Q! £921“ ﬂ . More on surface winds and vertical motion Differences in the I CE H ( L \ Lﬁ or elevation can cause air to rise or sink.
Air can move upslope or downslope. Example: Rocky Mountains --‘----—+-a---"- --,,,__-,,W-- ...
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- Fall '08