What approximate wind direction, speed, and temperature are expected for a flight over TUS at FL 270?

The correct answer presents the wind direction as 010 degrees true, a speed of 5 knots, and a temperature of ISA +13 degrees C, which aligns with the typical atmospheric conditions expected for a flight at flight level 270 over Tucson, Arizona (TUS), particularly taking into account the time of year and prevailing meteorological patterns.

At FL 270, which corresponds to approximately 27,000 feet, temperatures can significantly deviate from the International Standard Atmosphere (ISA). An ISA +13 degrees Celsius indicates a warmer-than-normal temperature at that altitude, which may occur due to weather systems influencing the region, such as high-pressure systems that can create warmer, drier air.

The wind direction indicated in this choice, 010 degrees true, suggests that the wind would be coming from the north-northeast. This aligns with typical upper-level winds during certain seasons, which can influence flight planning and fuel calculations.

The wind speed presented in this option is also moderate at 5 knots, appropriate for cruising altitudes and enabling efficient flight operations without introducing significant turbulence or complications.

In summary, this choice accurately reflects the expected aerodynamic and thermal conditions at the described flight level over the specified location, reinforcing its validity in terms of realistic flight planning and