Why does a maritime tropical air mass tend to bring humid weather and showers?

A maritime tropical air mass is characterized by warm, moist air that originates over warm ocean waters. As this air mass moves over land, it retains its humidity, leading to increased moisture in the atmosphere. When conditions are right, such as when the air is lifted or cooled, this moisture condenses to form clouds and precipitation, resulting in humid weather and frequent showers. The combination of warmth and humidity creates an environment conducive to storm development as well.