And why is a rapid DROP in them bad?
In: Planetary Science
A millibar is a unit of air pressure. It’s related to the SI unit for pressure (Pascal). 1 millibar is 100 Pascals. The highest air pressure ever recorded in weather is 1083 millibars and the lowest ever recorded is 870 millibars. All the weather known to humans is in between those two numbers so millibars is a convenient unit for tracking the changes up and down.
Low pressure is associated with storms (the big L’s on a weather map). High pressure is associated with clear skies (the big H’s on a weather map).
When a storm, already known to be low pressure, has its pressure dropping very rapidly, that means that the storm is getting stronger.
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