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Level of Free Convection (LFC) Level of Free Convection (LFC) is the level at which a parcel of saturated air becomes warmer than the surrounding air and rises freely. LFC in figure 6-2-10 is computed as follows:1. Find LCL. 2. Draw a line upward from LCL parallel to the nearest saturation adiabat until your line intersects the plotted temperature curve. This is LFC .Free convection in the atmosphere differs from forced convection in that free convection is brought about by one thing onlydensity differences within the atmosphere. When the required density difference does not exist, LFC
Figure 6-2-10.-Computation of the level of free convection. will not exist. In such cases, the saturation adiabat drawn upward on the Skew T from LCL fails to intersect the plotted temperature curve. Once a cloud in the developing stage reaches LFC, the cloud will continue to develop until it enters a level where the surrounding air is cooler than the air in the cloud top. We will look at this in more detail in the following section on positive energy areas and negative energy areas. |
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