What are high and low pressure systems? | Weather Wise Lessons

Have you ever looked at a weather map and thought, "I see a lot of H's and L's, but what do those actually mean?" Let's look at what pressure systems mean for our forecast.

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[placidotorres]

These girls make me want to learn everything about weather

[jessemohr]

Ok, so explain upper level pressure and lower level pressure systems and how they mix or cause storms

[mattalley]

So does this explain why, during the recent heat wave that affected the SW US it was slightly cooler than average where I live in the Pacific Northwest?

[Darkpixies]

How can a Low pressure system stay in the same place for a week?