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Weather "Under Pressure": Understanding Barometric Pressure

Winter is the perfect time of year to begin learning about the weather and how different facets of weather relate to one another. A major force that affects the weather is barometric pressure, or air pressure. Barometric pressure is best explained as the weight of the air pressing down on the Earth. This force is measured by a barometer. The first barometers, developed in the 17th century, consisted simply of a glass tube and a dish of mercury. The pressure of the air forces the mercury up the glass tube at standard increments, approximately 30 inches sea level. The greater the air pressure, the lower the mercury is in the tube; typically indicating fair weather. A lower air pressure allows the mercury to creep further up the tube; indicating potentially harsh weather. Newer barometers have since been invented which operate differently. The principles, however, remain the same.

Barometric pressure is important to understand, as it is a great indicator of weather patterns. In standing areas of high pressure, clouds and rain are inhibited. Hence, high pressure often indicates fair weather. When air pressure rapidly changes to low pressure, however, clouds, rain, and even ice and snow will form. Thus, weather is expected to worsen when air pressure is becomes low. It is important to note that it is the relative differences in air pressure which create the changing weather.

You may wish to become more knowledgeable about the air pressure in your area, and how it affects the weather where you live. You can start by studying local weather trends with one of our home or professional weather stations, and log the data on your computer with weather data software. This log can become a valuable resource for helping predict future weather trends. You may even wish to transmit your data to the National Weather Service as one of their weather spotter volunteers.

Learning more about the weather can be a fun and educational hobby for anyone, and can even help contribute to a better understanding of our environment. With the right tools, a little knowledge, and a willingness to learn, meteorology can become your newest passion. We have a large selection of amateur and professional weather stations available at www.bestnest.com. For more personal assistance, call our customer service line toll free at 877-562-1818 from 9 AM to 5 PM Eastern Standard Time Monday through Friday.

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