Meteorology · Atmosphere & Pressure
A barometer that is falling rapidly most likely indicates:
- AImproving weather and lighter winds
- BNo significant change for several days
- CAn approaching low-pressure system, with strengthening wind and deteriorating weather✓ Correct
- DThat the instrument needs recalibration
Explanation
A rapid pressure fall signals an approaching or deepening low. The faster the fall, the stronger the wind likely to follow. Mariners watch the rate and direction of the barometric tendency, not just the absolute reading.
Authority: Bowditch (Pub. No. 9)
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