Question 755Navigation General70% to pass
Your present weather is sunny with a steady barometer. A low swell approaches your vessel from the south with crests passing at relatively long periods of about four per minute. This usually indicates _______________.
AI Explanation
The correct answer is B) a tropical cyclone south of your vessel.
The description of the weather conditions, specifically the long-period swell approaching from the south, indicates the presence of a tropical cyclone or hurricane south of the vessel's location. Long-period swells are a characteristic of tropical cyclones, as they generate large, low-frequency waves that can travel long distances. The relatively low frequency of the swell crests, about four per minute, further supports the presence of a tropical cyclone, as they typically have a slower wave period compared to other weather systems.
The other options are incorrect because a warm front (A) would not typically generate such long-period swells, and an extra-tropical cyclone (C) or a hurricane (D) heading in the vessel's direction would likely be accompanied by other weather indicators, such as changes in wind direction and barometric pressure.
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