What is a common indication that a storm is approaching?

Dark clouds are a common indication that a storm is approaching because they signify moisture content in the atmosphere that may lead to precipitation. These clouds, often characterized by a dense, heavy appearance, suggest unstable weather conditions that can result in thunderstorms or severe weather events.

Observing dark clouds is typically an early sign for sailors and marine technicians as they prepare for adverse weather. It indicates that the atmospheric conditions are changing and that it's crucial to monitor weather updates closely and take necessary precautions.

Clear skies generally indicate stable weather, while strong winds can occur in various conditions, both calm and stormy. A sudden temperature drop can be an indicator of changing weather but is more ambiguous without other signs like the presence of dark clouds. Therefore, the appearance of dark clouds is a straightforward and reliable indication of an approaching storm.