![]() ![]() A strong high pressure system might have a pressure of 1040 mb, while a strong low-pressure system might have a pressure of 960 mb (some hurricanes have a pressure as low as 900 mb). As you would expect, pressure decreases as you go up…remember that airplane cabins must be pressurized and mountain climbers must carry oxygen as the air is so thin. Meteorologists use pressure as a vertical coordinate (we often use it instead of altitude).
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