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Computation of cloud formation parameters |
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COMPUTATION OF CLOUD FORMATION PARAMETERSSeveral graphical and mathematical computa-tions using the data plotted on a Skew T will let
Figure 6-2-5.-Computation of minimum temperature. us determine where clouds may form if certain conditions are met. In this section, we will look at the levels where we may expect cloud bases to form and the levels where we expect them to end.Lifting Condensation Level (LCL) Lifting Condensation Level (LCL) is the height at which a parcel of moist air becomes saturated when "lifted" dry adiabatically. The lifting is brought about by air being forced up (lifted over) frontal and orographic (hilly and mountainous) surfaces. Use this level for your estimate of cloud bases caused by mechanical lifting.LCL is computed using the surface tempera-ture and dew point. The computation is as follows:1. From the surface temperature, draw a line upwards parallel to the closest dry adiabat.2. From the surface dew point, draw a line upwards parallel to the nearest mixing-ratio line.3. LCL is found at the point of intersection of the two lines. See figure 6-2-6. |
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