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18 May 2017 Here are 5 things to know about low-pressure areas, including why In order for a low to form, something must happen to decrease air pressure over a during the passage of a low pressure system depends on where it is Air near the surface flows down and away in a high pressure system (left) and air flows up and together at a low pressure system (right). Credit: NESTA. Standing 3 Sep 2013 High and low pressure systems cause the day-to-day changes in our weather. In this article we look at how they are defined and how they form. 25 Sep 2016 Or: “expect rain to spread into the area as a low pressure system approaches.” It is well established that high pressure is generally associated 31 Jan 2013 To understand how high and low pressure systems form and interact you have to look beyond the Earth's surface temperature to the 27 Nov 2010 low pressure areas usually form between cold and warm air masses The air flows that develop around the low pressure system then help to Thermal lows form due to localized heating caused by greater sunshine over deserts and other land masses. Since localized areas of warm air are less dense than their surroundings, this warmer air rises, which lowers atmospheric pressure near that portion of the Earth's surface. 3 Mar 2017 A low pressure system, or "low," is an area where the atmospheric air that forms as the warm air descending from the tropics becomes hotter. Thermal lows form due to localized heating caused by greater sunshine over deserts and other land masses. Since localized areas of warm air are less dense than their surroundings, this warmer air rises, which lowers atmospheric pressure near that portion of the Earth's surface.
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