I recently listed a weather station which includes a barometer.  Since one doesn’t see barometers all that often, I thought I’d list a few facts about them here.

  •  Barometers measure air pressure. As weather patterns move around the globe, air can bunch up in certain locations, causing greater air pressure than in others. By measuring those local peaks and valleys in air pressure, a barometer can tell you a lot about the weather patterns in the area.

  • A high atmospheric pressure reading means a greater chance of clear, dry weather. When the air pressure is high, it means that the air is very dense. The density causes the air to slowly fall. When this happens, the air warms, which stops clouds from forming. Therefore, high pressure usually means clear weather.

  • A low atmospheric pressure reading means there is a greater chance of rainy weather. When the barometer is low, the air is not dense. This causes columns of air to rise higher in the atmosphere, where they get colder. If the air is moist, this can cause clouds to form and rain to fall.

  • Rising pressure usually indicates that the weather is clearing. Within the next 2 days, the sky will clear up and the weather will dry up.

  • The lower the barometer drops, rainier and windier weather is usually on its way. This is especially true if the weather is already bad. Barometric pressure often drops quickly right before a storm.

Barometers sometimes have markings with labels like “rain” or “clear weather” on them to help you understand the reading that you are seeing.

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