Meteorology · Barometer — Tendency
What does a rapidly falling barometer (e.g., 3 mb or more in 3 hours) most often warn of?
- ANo significant change
- BImproving, settled weather
- CA stationary high overhead
- DAn approaching, deepening low or storm with strengthening winds✓ Correct
Explanation
Pressure tendency is a key forecasting tool: a rapid fall signals an approaching or intensifying low and rising winds, while a steady or rising barometer suggests improving conditions. The rate of change matters as much as the value.
Authority: Bowditch (Pub. No. 9), barometric tendency; WMO
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