What does air pressure tell us about the weather?

Question

What does air pressure tell us about the weather?

Answer 1

The difference in air pressure tells us more about the weather than air pressure alone.  If the air pressure is increasing the weather is likely is improve.  If the air pressure is going down, worse weather can be expected.  Like everything else, nothing is absolute, especially in weather.  As an example, a thunderstorm can develope even within a high pressure area.