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... »

Pilot answers: Upper air data and forecasts

By Jack Williams ©2015

Q: I use RUC soundings for flight planning, but I am befuddled by the following: When I enter a station, load the Op40 soundings, and hover with my mouse over the loaded graph I see  bold numbers on the far-left near the Pressure (mb) line, and light numbers appear directly underneath my cursor with a dynamic pink line drawn from... »

Answers: Weather balloons and airplanes

By Jack Williams ©2015

Q: Hi, I enjoyed "Rise Up" in the March 2010 AOPA Flight Training magazine.   I wonder about  the danger of those weather balloons and noted your  comments about there being "no danger" as it's floating down under parachute. But really, hasn't there ever been an incident or accident associated with one of these balloons where one of them (either... »

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,... »