The ground temperature was 20 degrees F while the warmest and supposedly lowest portion of the cloud was -7 degrees. Assuming a dry adiabatic lapse rate of 5.4 degrees per 1,000 feet, the cloud base was at an altitude of 5,000 feet. The highest point of the cloud was 2,200 feet higher.
|Colder and presumably higher portion of a cumulus cloud|
|The cloud's warmer ba|