FAA Aircraft Dispatcher Practice Exam

How does the spacing of isobars relate to surface winds?

1. Closer isobars indicate calm winds

2. Wider isobars indicate gusty winds

3. Closer isobars indicate stronger winds

4. Isobar spacing does not affect wind strength

The correct answer is: Closer isobars indicate stronger winds

The correct choice highlights a fundamental principle in meteorology. When isobars, which are lines that connect points of equal atmospheric pressure on a weather map, are spaced closely together, it indicates a significant pressure gradient over a short distance. This steep pressure gradient results in stronger winds as air moves more rapidly from areas of high pressure to areas of low pressure in an attempt to equalize the pressure differential. In contrast, when isobars are spaced farther apart, the pressure gradient is shallow, which corresponds to lighter winds. This relationship is critical for understanding wind patterns and predicting weather changes, making it essential knowledge for those in the aviation sector. Thus, the correct answer accurately reflects the relationship between isobar spacing and wind strength, reinforcing that closer isobars correlate with stronger winds.