Question

Sounding plotted on skew-T diagram

What is the level of free convection (LFC) for the surface layer in this sounding?
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LFC = hPa

Answer: The LFC = 650 hPa.
From the surface dewpoint (Td =13°C), proceed up the saturation mixing ratio line. From the surface temperature (T =27°C) proceed up the dry adiabat. The two lines intersect at the LCL = 835 hPa. From the LCL, proceed upward along a saturation adiabat until it intersects the temperature curve. The level of this intersection is 650 hPa, which is the LFC.
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