Atmosphere
Barometric Pressure
What does the barometer actually tell you? The guides below cover the units and their conversions, station vs sea-level readings, why the 3-hour trend is the number forecasters watch, and what a falling barometer means for the weather ahead — and for pressure headaches. No ads, no app.
Barometric pressure guides
Plain-language reference on reading the barometer — the units and their conversions, station vs sea-level readings, and why the 3-hour trend is the number forecasters actually watch.