Westerly winds in the upper atmosphere at mid-latitudes in the northern hemisphere:
a. are a result of a pressure gradient that moves air from the poles toward the equator.
b. are stronger in summer than in winter.
c. are the reason most mid-latitude storms move from west to east.
d. are moving perpendicular to 500 mb contours.

The answer is C. These winds are called westerlies, intuitively because they blow from west to east. They are as a result of high pressure in the sub-tropical latitudes and blow towards the poles where there’s lower pressure. The winds are strongest in the winter and weakest in the summer.

ANSWER:

Westerly winds in found in the upper atmosphere at 'mid-latitudes' in the northern hemisphere are the 'reason most mid-altitude storms' moves from 'west to east'.

EXPLANATION: