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A parcel at the surface has a temperature of 25 degrees and a dew point of 15 degrees.

At approximately what height will cloud base be found?

  • A.About 125 metres, since the dew point depression of ten kelvin corresponds directly to that many metres
  • B.About 2500 metres
  • C.About 10000 metres, which would place the cloud base close to the level of the tropopause above the site
  • D.About 1250 metres

Answer: D

Applying the rule of 125 metres per kelvin of dew point depression to a depression of 10 kelvin gives a lifting condensation level near 1250 metres. That is a typical summer cumulus base over land. The second option confuses the rule's coefficient with the answer, which is an easy slip to make when working quickly.

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