EES 108 Class 13 - Last Night's Weather Significant Tornado...

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Last Night’s Weather Significant Tornado outbreak Arkansas, Mississippi, Tennessee, Kentucky 22 dead, scores injured Tennessee 12+ dead, 60+ injured Most in Memphis area
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Storm Damage in Memphis
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Dormitory, Union U., Jackson TN
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Dorm Parking Lot, Union U.
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Remains of house, Sumner County
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What caused this?
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What caused this?
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Stable Unstable
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SWEAT index: 488 Interpretation: <272: Low risk  273-299: Slight  risk 300-400:  Moderate risk 401-600: Strong  risk, isolated  tornadoes  possible 601-800:  High risk,  scattered  tornadoes >800: High wind  damage, little  tornado risk
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Meteorology and Air Pollution Faster wind Moves pollution away faster Dilution in horizontal direction Increases thickness of “boundary layer” Boundary layer is where air is turbulent and mixes thoroughly Dilution in vertical direction
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Valley inversion Typical for Nashville This kind of inversion is most common in  winter and at night
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Inversion traps pollution in Grand  Canyon
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Typical Los Angeles Inversion Descending air from a high-pressure cell, “Pacific High” Same cell also causes Santa-Ana winds
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Inversion traps smog in LA
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Chimney Effect
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Frequency of reduced dispersion
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Sulfurous (coal) smog Meteorological  conditions trap smoke Largely primary  pollutants More common in winter  and at night Why?
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Photochemical Smog Ingredients:
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