Changes in barometric pressure rank among the most common ways to predict weather patterns. Measuring varying pressure over a wide region enables meteorologists to map this data and understand how weather patterns interact and move across a given area, for accurate and timely forecasts. For example, decreasing barometric pressure generally indicates storms or rain, while increasing pressure can mean calm, dry or colder weather.
The higher you rise in the atmosphere, the less pressure exerts upon you. Specialized barometers take into account normal barometric pressure and then compensate for the difference in distance from the ground, for an accurate reading of altitude. In situations with limited visibility, this information allows pilots to safely navigate. Hikers and climbers employ barometric altimeters to map their locations and record their progress.
Verifying scientific experiments in different parts of the world can be problematic. Taking barometric readings during experimentation or observation lets scientists ensure accurate results. Atmospheric pressure has a profound effect on many aspects of modern life, and some manufacturing processes require specific pressures to function correctly. For example, the pharmaceutical and electronics manufacturing industries control barometric pressure in parts of their assembly processes to maintain quality control.
As newer, lower-cost electronic barometers became widely available, people have begun monitoring their health with respect to atmospheric pressure. The National Migraine Association reports that sufferers of migraines and arthritis who pay specific attention to pressure readings can determine when to take medication. For many, anticipating pressure changes helps them lead more active and pain-free lifestyles.