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It refers to the air pressure. Ordinary air pressure is around 1000 millibars. The lowest ever recorded is in the eye of a hurricane, at 870 millibars. The highest pressure is around 1090 millibars, at very low altitudes.
Low-pressure systems are generated by heat. Hot air expands, producing lower pressure. The various layers of air are also a factor: mountains interfere with the winds, causing turbulence that can lead to areas of low pressure. Air layers in the atmosphere mix.
Similarly, cold conditions and the other sides of mountains tend to develop high pressure conditions.
Air flows naturally from high pressure to low pressure, depending on the geography and other atmospheric conditions, so wind tends to flow from high to low pressure areas.
Low-pressure systems are generated by heat. Hot air expands, producing lower pressure. The various layers of air are also a factor: mountains interfere with the winds, causing turbulence that can lead to areas of low pressure. Air layers in the atmosphere mix.
Similarly, cold conditions and the other sides of mountains tend to develop high pressure conditions.
Air flows naturally from high pressure to low pressure, depending on the geography and other atmospheric conditions, so wind tends to flow from high to low pressure areas.
source(s):
http://hugoweatherblog.blogspot.com/2006/06/strongest-lowest-pressure-ever-...
http://hypertextbook.com/facts/2005/FlorenceHang.shtml
http://hugoweatherblog.blogspot.com/2006/06/strongest-lowest-pressure-ever-...
http://hypertextbook.com/facts/2005/FlorenceHang.shtml
Voted as best: buddawiggi
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