When checking the weather what does the pressure tell you?

Question

When checking the weather what does the pressure tell you?

In: 503

Answer 1

The atmosphere at any given time can hold a certain amount of water. The largest determining factor aa to *how much* water is the atmospheric pressure.

Higher pressures can hold more water. If a lot of water is IN the atmosphere and all of a sudden the conditions change such that there is more water than it can hold, well… I’m sure you can imagine what happens next.

Now two pockets or bubbles of atmosphere with different conditions, let’s say differing in pressure – they are like oil and water. They do not want to mix. Generally for a high pressure and a low pressure system to equalize something violent tends to happen. The boundary and movement of these pressure systems is how you can predict when and where weather happens.