Herb, from Aledo, writes to ask about the barometer reading and if, when we report a reading in the Quad-Cities, it will be the same for Aledo or any other area town. Pressure does vary with distance ...

Your phone tracks air pressure—and that tiny detail can warn you about weather changes early.

I've had a couple of recent e-mails asking about barometer readings, what they measure and what those readings mean. What a barometer measures is the weight of the air above it. The standard ...