Any preflight briefing should include a Winds Aloft Forecast (FD) and, it's hoped, you'll never have to actually interpret a raw FD except on FAA exams ... or here. Interpret this FD for 39,000 feet:



Wind 230 at 107 knots, temperature -59 Celsius


Wind 230 at 107 knots, temperature -59 Fahrenheit


Wind 300 at 07 knots, temperature -59 Fahrenheit


Wind 330 at 07 knots, temperature -59 Celsius

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