Here's a quote from a great internet site that will give you a good short overview of what tends to happen when we are under low and high pressure conditions.

"Now there is much more to it than just high pressure = nice weather and low pressure = bad weather (otherwise I would be out … Read more

I'm no expert, but here's the basics as I understand it.  I think of the Earth like a casserole.  It's not perfectly even all over the world.  There are pockets of granite here and sandstone there, like there are gooey cheesy bits here and meat there. 

Same with the air.  It's thick here and thin … Read more

Well gosh darn it . I really want to dig  into this to give a prettier answer but right now I am a bit tired. All I know is when the pressure goes down real low here, we have  the ability to have a slew of tornadoes. When the pressure is high, clouds have a … Read more