What approximate wind direction, speed, and temperature should a pilot expect when planning for a flight over EMI at 9,000 feet?

The correct answer reflects the prevailing weather patterns typically encountered at 9,000 feet over the specified area. When flying at this altitude, pilots usually anticipate wind directions that align with high-altitude jet streams, which often prevail from the west (around 270 degrees true). The wind speed of 28 knots is a reasonable expectation at this altitude, as winds tend to increase with height due to less friction from the surface.

The temperature of -10 degrees Celsius is also consistent with the standard lapse rate in the atmosphere where temperature decreases with altitude. At 9,000 feet, temperatures can be expected to be significantly below freezing, particularly in certain geographical areas and seasons.

Other choices do not align with typical atmospheric conditions at that altitude. Some may suggest wind speeds or directions that do not represent common patterns, or temperatures that fall outside the expected range for that altitude. The selected choice illustrates a realistic scenario that pilots can plan around, demonstrating an understanding of both atmospheric science and practical flight planning.