Adiabatic Cooling-Warming
30C 14C
20C 12C
10C 10C
Dew point decreases
with height at a rate of 2oC/km b/c DP varies less with Pressure than Temp.
The rate is
much less than
cooling rate for air.
Thus,
unsaturated air can become
saturated IF it rises far enough.
Red=Temperature
Blue=Dew Point
Ahrens, Fig 5.2