Meteorology for Air Pollution Control Engineers26

Meteorology for Air Pollution Control Engineers26 -...

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1 n The inverse of this scenario occurs below a thundercloud.  n If the thundercloud releases large water drops into  relative dry air below its base, they will evaporate as they  fall. n That cools the air, making it more dense than the  surrounding air.
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2 n It descends rapidly, causing a strong downdraft.  n At the surface it spreads radially outward in all  horizontal directions. n This meteorological event is called a wind shear, although  downdraft or downburst is more descriptive of what 
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Unformatted text preview: happens. 3 4. Winds 4.1 Velocities n The highest ground-level wind velocities are those in tornadoes, up to 200 mi/h (89.54 m/s). n The average ground-level wind velocity in most of North America is about 10 mi/h (4.5 m/s). 4 n The wind rarely blows less than about 2 mi/h (1 m/s). n If you are standing outdoors in a 2 mi/h wind, you cannot feel it. n The wind velocity measuring instruments are called anemometers....
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This note was uploaded on 10/14/2011 for the course CIVL CIVL345 taught by Professor Hsinchu during the Spring '11 term at SUNY College of Environmental Science and Forestry.

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Meteorology for Air Pollution Control Engineers26 -...

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