Make sure your barometer is on a flat surface and the needle is ALMOST touching the paper, but is NOT touching it. Never move or touch any part of the barometer for a couple weeks.

A barometer is the instrument we use to measure air pressure. At the bottom of this post, I’ll explain why air pressure is critical in forecasting the weather.

Of all the features you may have noticed on your iPhone, one that stands out is the Barometer. What does this tool do, and how do you use it?