Air moves into a Low pressure system. It pushes any air that was there upwards.
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Low Pressure Systems
Have you ever seen a
weather map with a red L on it? This red L means there is a low
pressure system over that area of the map. Just what does that mean?
It means that that area has lower pressure than the air around it.
When there is a Low above your house, you should expect cloudy skies and maybe even rain or snow! The way I remember it is that a Low will make me feel low because "bad" weather is on the way...
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