## Calculating Adiabatic Cooling Look at the topographic Profile below and calculate the temperature at the top of the mountain. Assume that the air parcel is forced to rise up and over an 8,000-foot elevation mountain. The initial temperature is 65.5°F at sea level on the Windward (west) side of the mountain. Assume that the Lifting Condensation Level (LCL) is at 3,000 feet elevation where the Dew Point occurs. The Adiabatic Lapse Rate is 3.6°F = 1,000ft in elevation. To simplify, round down to 3°F. Find the difference in elevation from sea level and final elevation. Multiply lapse rate by feet in thousands. (3° x 8”) = 24° F Next, subtract difference in temperature (24°) from sea level temperature to get your apex temperature. (65.5°-24°) = 41.5° F Temperature on top of mountain is 41.5°F Now you try it! * Note: The calculation produces an approximate ambient temperature. Seasonal, diurnal, and other variations should also be considered. 78º 96º 6,000ʼ 9,000ʼʼ ______ º F ______ º F

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