Assume that an aircraft is flying in the northern hemisphere at the 500 hPa pressure surface on a heading of 270 degrees. Which of the following statements is correct?
If in this pressure surface the wind comes from the direction 360 degrees, then true altitude is increasing.
If in this pressure surface the wind comes from the direction 180 degrees, then true altitude is increasing.
If in this pressure surface the wind comes from the direction 270 degrees, then true altitude is increasing.
If in this pressure surface the wind comes from the direction 090 degrees, then true altitude is increasing.