Discussion
A surface parcel is at 25 degrees Celsius with a dew point of 15 degrees. The cloud base is at approximately
Answer: D
Correct answer: 1250 metres
The dry adiabatic rate is about 10 degrees per kilometre and the dew point falls about 2, so the two close at roughly 8 degrees per kilometre - giving the rule of thumb \[ h \approx 125\,(T - T_d) = 125 \times (25-15) = 1250\ \mathrm{m}. \] The 2500 m offered uses the temperature depression twice over, and 125 m drops a factor of ten.
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