Moisture and Atmospheric Stability

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Chapter 4 Moisture and Atmospheric Stability
The Atmosphere 10e Lutgens TarbuckPower Point
by Michael C. LoPresto
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Steam Fog over a Lake
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The Hydrologic Cycle
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Waters Changes of State
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Ice
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Water
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Condensation of Water Vapor Generates Fog
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Frost on a Window Pane
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Humidity Is the Content of Water Vapor in the
Air
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Relationship between Vapor Pressure and Saturation
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Saturation Vapor Pressure Varies with Temperature
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Hot desert air with low relative humidity will
actually have a higher water vapor-content than
frigid air with high relative humidity
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Relative Humidity
Changes with Added Moisture
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Relative Humidity
Changes with Temperature
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Daily Changes in Relative Humiditywith
Temperature
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Cold Drinking-glasses Chill Surrounding Air to
the Dew-Point
Condensation on Cold Drinking-glasses
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Dew Point Temperatures
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Sling Psychrometer
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Adiabatic Temperature Changes
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Dry and Wet Adiabatic Rates
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Lifting Processes
Orographic
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Heavy Precipitation in Mountains
Snow Pack in the Rocky Mountains
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Death Valley
Rain Shadow Desert
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Frontal Wedging
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Convergence
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Convergence over Southern Florida
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Wetter Windward Locations and Leeward Rain
Shadows
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Convection
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As long as air in a balloon is hotter than the
surrounding air, it will rise
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Adiabatic Cooling
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Atmospheric Stability

• Absolute Stability

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• Absolute Instability

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• Conditional Stability

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An Unstable Atmosphere
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Chapter 4

• END