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Answers: Inside Weather Fronts

By Jack Williams

Q: In the November issue of AOPA Flight Training, you discuss extratropical cyclones, including the movement of cold air under warm air and vice versa. If I understand this correctly, the fronts themselves do not discriminate between the cold or warm air ahead of them.  How  do you explain movement under (cold into warm) or movement over (warm into cold)? Kevin,... »

Ask Jack: Humid Air

By Jack Williams

Q: Why is humid air less dense than dry air? Matt, LaGrange, Ga. A: At first it might seem strange that humid air is actually less dense than dry air at the same temperature.  Most of the time we say things... »