An area remains under a nearly stationary air mass for several days with warmth and frequent thunderstorms. From which region did this air mass most likely originate?

An area remains under a nearly stationary air mass for several days with warmth and frequent thunderstorms. From which region did this air mass most likely originate?

• A. Arctic
• B. Maritime Tropical
• C. Continental Polar
• D. Maritime Polar

Answer: (B)

Air masses carry the characteristics of their source region, and a warm, humid air mass that stays over an area for days and fuels frequent thunderstorms points to a maritime tropical origin. Maritime tropical forms over warm tropical oceans, bringing warm temperatures and high humidity that easily trigger thunderstorms when it sits over a region. In contrast, Arctic air is cold and dry, Continental Polar is cold and dry, and Maritime Polar is cool and moist but not notably warm or thunderstorm-prone. So the warm, stormy conditions described come from a maritime tropical air mass, such as one that forms over the Gulf of Mexico, Caribbean, or subtropical Atlantic.

Air masses carry the characteristics of their source region, and a warm, humid air mass that stays over an area for days and fuels frequent thunderstorms points to a maritime tropical origin. Maritime tropical forms over warm tropical oceans, bringing warm temperatures and high humidity that easily trigger thunderstorms when it sits over a region. In contrast, Arctic air is cold and dry, Continental Polar is cold and dry, and Maritime Polar is cool and moist but not notably warm or thunderstorm-prone. So the warm, stormy conditions described come from a maritime tropical air mass, such as one that forms over the Gulf of Mexico, Caribbean, or subtropical Atlantic.