Many people have claimed to be able to "predict" approaching rainstorms by observing pains in various parts of their bodies, particularly in the joints and bones. It has been suggested that variations in barometric pressure may be the cause of this phenomenon.
ABOUT THIS GRAPHIC
The numbers above show the barometric pressure at the beginning of the day, and the end of the day. By looking at the numbers, you will be able to tell if the atmospheric pressure is expected to rise (or fall) drastically.
Barometric pressure is defined as the "amount of pressure exerted against a surface by the weight of the air in the atmosphere." The atmospheric pressure is measured by a barometer, hence the term "barometric pressure."
People encounter barometric pressure changes when high and low pressure systems move through an area, or when they travel from low altitudes to high altitudes. The easiest way to tell if barometric pressure will drastically change in your area is if immediate severe weather has been forecast; storms indicate that areas of low air pressure are moving through.