Which major air mass is maritime tropical and typically brings warm, moist conditions?

• A. cT (continental tropical) – warm and dry.
• B. mT (maritime tropical) – warm, moist.
• C. cP (continental polar) – cold and dry.
• D. mP (maritime polar) – cool, moist.

Answer: (B)

Air masses are defined by where they form and whether they bring moisture. A maritime tropical air mass forms over warm tropical oceans, so it carries both high humidity and warm temperatures. That combination makes it the one that typically brings warm, moist conditions as it moves into land areas. It often brings humid weather and can fuel showers and thunderstorms, especially in summer, when tropical seas heat up and evaporation is high. The other air masses either lack the moisture (continental tropical is warm and dry), are cold and dry (continental polar), or are cool and moist but not warm (maritime polar). So maritime tropical best fits the description of being warm and moist.