Question 1320Navigation General

The correct answer is C) a change in the present weather conditions. A rapid rise or fall of the barometer indicates a change in the current weather conditions. This is because changes in atmospheric pressure, as measured by the barometer, are directly related to changing weather patterns. A rapid rise or fall signals that a weather system is moving in or out of the area, which will result in a change to the current weather conditions. The other options are incorrect because they do not accurately describe the meaning of a rapid barometric change. A rapid barometric change does not necessarily indicate the onset of fog (A), a decrease in wind velocity (B), or heavy rain within six hours (D). Those weather events may occur, but they are not the primary meaning of a rapid barometric change.