Other Levels » Level of Free Convection (LFC) Skew-T Procedure
From the lifting condensation level (LCL) proceed upward along a saturation adiabat until you intersect the sounding temperature curve. The level of this intersection is the LFC.
From the lifting condensation level (LCL) proceed upward along a saturation adiabat until you intersect the sounding temperature curve. The level of this intersection is the LFC.
In this example, the surface T = 9°C and Td=0°C, resulting in an LCL of 870 hPa and an LFC of 675 hPa.