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SKEW-T Notes - Skew-T Notes Basic Diagram Isobars...

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Skew-T Notes Basic Diagram Isobars- horizontal lines o Rise logarithmically Isotherms- straight, positive-sloped lines Dry adiabats- solid, curved lines o Descend from left to right Saturated adiabats- dashed curved lines o Random patterns- vary with pressure and temperature o Generally ascend from right to left Saturated mixing-ratio lines- dashed, positive-sloped lines Moisture/Humidity Assessment Saturation Mixing Ratio (W s ) g/kg W s = M v apor /M dry air Max. Amount of water air can hold w/o condensation 1. use T profile & pressure Mixing Ratio (W) W= M v apor /M dry air Amount of water vapor present in air 1. use T d curve & pressure Relative Humidity (RH) RH= (W/W s )*100 Specific Humidity (q) q= M v / (M v + M d ) Mass of water vapor per mass of moist air Dewpoint Depression Difference between T & T d Saturation Vapor Pressure (e s ) Part of atmospheric pressure attributable to water vapor if air is saturated (Max. vapor pressure in air is saturated) 1. Temperature at specified pressure 2. Isotherm to 622 hPa 3. Value of saturation mixing line Vapor Pressure (e) Part of atmospheric pressure attributable to water vapor 1. from the given dewpoint 2. Follow isotherm to 622 hPa
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3. e is the value of the saturation mixing line Specific Humidity (q) q=M vapor / (M vapor + M dry air ) Temperature/Levels Assessment Virtual Temperature (T v ) Temperature that dry air would have to be to have the same density as moist air Same T v means same density Water vapor is less dense than dry air
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