Question 1190Navigation General

The correct answer is C) a fast approaching line of dark clouds. The formation of a fast approaching line of dark clouds is an indicator of a potential sudden wind event, such as a squall or thunderstorm. These dark clouds typically signal the arrival of a weather front, which can bring about a rapid increase in wind speed and potentially hazardous conditions for mariners. This type of cloud formation is a reliable visual cue that can help Coast Guard captains and other seafarers anticipate and prepare for changes in weather that may affect the safety of their vessel and crew. The other answer choices, while potentially indicating general weather conditions, do not specifically point to the imminent arrival of a sudden wind event in the same way as a fast approaching line of dark clouds.