Question 1075Navigation General

70% to pass

What indicates the arrival of a hurricane within 24 to 36 hours?

A Long bands of nimbostratus clouds radiating from a point over the horizon
B The barometer drops 2 millibars between 1000 and 1600
C Unusually good weather with above average pressures followed by a slow fall of 4 millibars in six hours
D The normal swell becoming lower and from a steady direction
AI Explanation

The correct answer is C) Unusually good weather with above average pressures followed by a slow fall of 4 millibars in six hours. This is the correct answer because a rapid drop in barometric pressure, typically around 4 millibars over a 6-hour period, is a reliable indicator of an approaching hurricane within the next 24-36 hours. The unusually good weather with above average pressures prior to the rapid pressure drop is also a characteristic pattern associated with the approach of a hurricane. The other answer choices are incorrect because they do not accurately describe the typical weather patterns and pressure changes associated with the imminent arrival of a hurricane.

Ready to test your knowledge?

Take a Navigation General Practice Exam

Want to practice with timed exams?

Download Coast Guard Exams for the full exam experience.

Get the App