Question 1
When are upper air winds fastest?
◦ in summer
◦ in winter
◦ whenever the temperature gradient is weak
◦ These winds maintain roughly the same speeds throughout the year.
Question 2
Why do storm systems move from west to east in mid latitudes of the Northern Hemisphere?
◦ The prevailing wind is from the east, and the storm systems move toward the surface flow.
◦ The storms are steered by approximately west to east winds aloft that are approximately geostrophic winds produced by Coriolis forces.
◦ The prevailing wind is from the west.
◦ The continents break up air flow that would normally be south to north and the Coriolis force turns the storms to the right, or toward the east.