Question 947Navigation General

The correct answer is C) Tropical disturbance. Tropical disturbances do not have closed isobars, which are lines of equal atmospheric pressure. Hurricanes, tropical depressions, and cyclones all have closed isobars, which define the circular wind pattern around the storm's center. In contrast, tropical disturbances are areas of unsettled weather with no closed isobars, typically characterized by a broad area of low pressure without a well-defined circulation. The other answer choices (A, B, and D) are incorrect because hurricanes, tropical depressions, and cyclones all have closed isobars, which is a defining characteristic of these stronger tropical systems.