How do I predict the weather with a barometer?
When you are at a constant elevation a barometer will measure the change in composition and density of the air mass above the barometer. The composition usually changes because of changes in humidity. The density changes usually as a result of a change in temperature of the air mass.
Roughly, falling barometric pressure typically leads bad weather, and rising barometric pressure indicates improving weather. Here are some generalizations about weather conditions that one can make from wind direction and barometric measurement changes from the National Weather Service:
Creation Date: 10/7/2004