Which of the following phenomena is commonly connected with active thunderstorms?

Active thunderstorms are typically associated with low pressure areas. This connection arises because thunderstorms form in regions where the atmospheric pressure is lower than surrounding areas. The low pressure allows warm, moist air to rise rapidly, which is a fundamental process in thunderstorm development. As this air rises, it cools and condenses, leading to the formation of clouds and precipitation, characteristic of thunderstorms.

In contrast, gentle winds, static weather conditions, and high pressure systems do not support the dynamics necessary for thunderstorms. Gentle winds usually indicate stable atmospheric conditions that are less conducive to the updrafts required for thunderstorm formation. Static weather conditions suggest a lack of significant air movement or instability, which again would not favor the development of thunderstorms. High pressure systems are associated with descending air that typically suppresses cloud formation and precipitation, making them unlikely environments for thunderstorms to occur.

Thus, recognizing the relationship between low pressure areas and thunderstorm activity is crucial for understanding weather phenomena.