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Need help understanding pressure vs weather systems
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[QUOTE="Square1, post: 5464697, member: 365401"] This is a subject that confuses me for a long time. Everywhere I go to get an understanding, I seem to run into the same explanations over and over which don't really do that much explaining. I find that only the basic elements of weather are explained, and overly basic examples that utilize them are used. So, I would love for people to read my introductory post, answer some questions, and from there I can probably ask some follow up questions as needed to get to the bottom of some things. I know that in the end, for rain to happen, the water in the air must condense into liquid from its vapor form..and fall down...There seem to be different ways that this can happen though. One common explanation here is, to imagine hot sunny days (and presumably clear...) where the ground ends up heating up a lot. The surrounding air warms up, rises, and starts to cool at one point to form clouds and rain. Presumably the surface air has more water in it than upper air, so the new air can last only so long at higher altitude before its water condenses out. (1) So how can you have a condition where it is really hot for days during the summer while the air is getting pumped into the sky, and yet, the skies remain practically clear? (2-a) On a related note, let's say that location did end up getting rain. It is said that rain is associated with low pressure systems. Is it because as an area warms up, the air expands, [I]pressure drops[/I] (the air is not closed off), rises, condenses, rains..etc, meanwhile the area still somehow remains relatively warm therefore the pressure is low? (2-b) But when it rains it is generally cooler than it was before. How to reconcile this? (2-c) Why in that case do we have those [I]high [/I]pressure systems which commonly bring in heat waves or warm weather in the summers? That's where I would like to begin. Thank you all :) [/QUOTE]
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