Tag Archive
Answers: heating, cooling degree days
Q: Several years ago, you wrote a short article for USA TODAY about heating degree days. I have depended on that article, and its links, to monitor the heating and cooling degree days in my area. Now, I cannot access this article any longer through a USA TODAY search and I'd really like to have access to it. I would... »
Answers: Finding wind data
Q: What is your favorite source for near real time surface wind visualizations in the mid Atlantic region. I need the information for balloon flight planning in the field. Curt, Falls Church, Va. A: I’ve yet to find any really good visualizations for surface winds because none show the winds in any real detail. That said, best that I've found are NWS... »
Answers: Supercooled water
Q: How can water that is below 32 degrees F (zero degrees C) remain in liquid form and not freeze? That is, become "supercooled"? Matt, LaGrange, Ga. A: The best way to begin understanding how supercooled liquid water forms is to forgot what you've been told about water "freezing at 32 degrees F." This is really the temperature at which ice... »
Answers: Aircraft altimeter errors
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... »
