DPT and Uplift of an Air Mass 16. Our ground level instruments are checked at 10

Question

DPT and Uplift of an Air Mass 16. Our ground level instruments are checked at 10:00 am under clear sky conditions. They indcate the following: T 35 C and SH12 gkg. A Thermal Low Pressure system creates uplift of the air mass. Assuming SH remains stable, at what altitude will the air mass reach Lifting Condensation Level (LCL) and Cloud Formation ill occur? Apply the Dry Adiabatic Rate (DAR) to calculate your 17. Consider the same air mass from question 16: the velocity of uplift is measured at 300 meters per hour. At what time can we expect cloud formation? 18,

Explanation / Answer

16)

first we have to calculate Td (Dew temperature)

Td = T -(100-SH/5)

    = 35-(100-12/5)

    = 35 -17.6

    = 17.4 C

Now LCL = 125(T -Td)

              = 125( 35-17.4)

              = 125*17.6

              = 2200 m

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