Question 1080Navigation General

The correct answer is C) An exceptionally long swell. The first visible indication of the presence of a tropical cyclone or hurricane is an exceptionally long swell. As a tropical system develops over the open ocean, it generates large swells that radiate outward from the storm's center. These swells can be detected long before the actual storm system becomes visible on the horizon, providing an early warning sign of the approaching system. The other options, such as stratocumulus clouds, increasing winds, and dark clouds, are generally later-stage indicators that the storm is closer to the observer's location.