Meteorology · Forecasting — Single-Station Pressure Trend
Aboard a vessel without charts, a rapidly and steadily falling barometer together with a backing wind suggests:
- AAn approaching depression and worsening weather; take precautions✓ Correct
- BImminent clearing and calm
- CNo change for several days
- DA passing high-pressure ridge
Explanation
A steady, rapid pressure fall signals an approaching low; a backing wind (shifting counterclockwise in the Northern Hemisphere) often means the low will pass nearby or the vessel is on a particular side of it. The combination warns the mariner to prepare for strengthening wind and sea.
Authority: Bowditch (Pub. No. 9); single-station forecasting
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