Question

Upon awakening one morning in St. Louis, Missouri, you notice that the sky is clear, but the temperatures in the area are well below freezing and the humidity is low. What is the most likely source region of the air mass affecting St. Louis? a.The Pacific Ocean b.Maine c.Siberia d.Northern Canada

Answer 1

D

Step-by-step explanation:

Missouri has a strong seasonality. In winter, Missouri experiences dry-cold air mass, that is come from the north side plains and Canada.

In summer, Missouri temperatures are affected by the air masses from the north of the Gulf of Mexico resulting in a moist, warm air mass.