Tag Archive

Answers: Aircraft altimeter errors

By Jack Williams ©2015

Q: Can you help me understand in very simple terms altimeter error when flying from high to low pressure areas and from low to high areas?  I am studying it but its just not clicking.—Mark, Noblesville, Ind. A: To answer  your question I'll begin with some basic information about aircraft altimeters and then use the diagram below to help you see... »

Answers: Rising and Sinking Air

By Jack Williams ©2015

Q: In your AOPA Flight Training Magazine, January 2010 article you say that the curving path of upper air winds cause air to sink in some areas, creating high pressure at the surface, and to rise in other areas creating or strengthening areas of low pressure at the surface.  My question: How does adding rising air to an area, which... »

Answers: Inside Weather Fronts

By Jack Williams ©2015

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,... »

Answers: Extratropical Cyclone Winds

By Jack Williams ©2015

Q: My question is about your article in the November  AOPA Flight Training magazine on tropical cyclones.  I'm trying to reconcile two potentially different ideas: first, that a cyclone has swirling air (which I assume to mean the the air masses are rotating around the Low), and second, that the warm front and cold front are generally in the same... »