F2011GEOG1112CloudsLecture copy

F2011GEOG1112CloudsLecture copy - 1 Clouds: Maybe the...

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1 Clouds: Maybe the Prettiest Topic of the Semester Photo by my former student, Cynthia Stoneburner Appeared in Nature magazine, 2 August 2007 (all sorts of colors and clouds, including a contrail!)
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2 How Do Clouds Form? Clouds form when: RH = 100% (actually, need RH >100% or “supersaturation” at tiny scales in clean air; aerosols make it easier.) This happens when one or more of these occur: 1) air rises & cools to the dew point, i.e. RH=100% 2) moisture is added to air to make RH=100% More than one way for air to rise, remember: orographic lifting, convection, frontal lifting, surface convergence. Next: cloud types . They tell us lots about the weather!
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3 Learn Cloud Types, The Prof. Knox Way! Know the names of the OTHER three Dwarfs who didn’t make the cut at Disney: WISPY LUMPY SHEETY Like a feather Like cauliflower Like paper From the ground to the top of the atmosphere, clouds come in these three basic shapes!
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4 Ten Cloud Types Altitude Prefix Shape Prefix/Suffix Cloud Water Type
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F2011GEOG1112CloudsLecture copy - 1 Clouds: Maybe the...

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