Question

Sounding plotted on skew-T diagram

This sounding is fairly typical of a summer morning along the coast in Northern California.

What is the dewpoint depression for the following heights in this sounding?
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Dewpoint depression (surface) = °C

Dewpoint depression (sfc) = 0°C.
Conditions at the surface appear saturated, probably indicating fog.

Dewpoint depression (850 hPa) = °C

Dewpoint depression (850 hPa) = 44°C.
Rapid drying conditions above the fog support radiative and evaporative cooling at the fog top. This cooling helps to maintain the fog.
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