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Weather & Water

Atmospheric pressure

Technical visualAtmospheric pressure trend
Atmospheric pressure trendA pressure trace falls steadily across time while an arrow emphasizes the trend.falling trendtime
Atmospheric pressure trendA pressure trace falls steadily across time while an arrow emphasizes the trend.121falling trend2time
The direction and rate of pressure change add context to the current reading; use them with forecasts and observations.

Marine observations typically report pressure in hectopascals or millibars.

Pressure and pressure tendency help describe weather systems, but a single pressure number is not a boating go/no-go threshold.

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