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any other country in the world. it is is that true? tell us why. that s absolutely true. i don t have quite the map to show it to you here but i can get most of it. but over here we have the rocky mountains, down here the gulf of mexico. the rocky mountains will make a low pressure center, a trough, called a leeside trough. it makes the jet stream sometimes turn like this. when the jet stream turns like this think of jet stream like an interstate. little pieces of low pressure will run through that jet stream in streaks, in little you ll know when you re flying from new york to l.a., it takes you five hours. when you fly from l.a. to new york it takes you four hours. you say howdy get there so fast? because they were going with the jet stream. as that jet stream moves in we get moisture, humidity you need for a storm, cold air, you need that for a storm, and you can get dry air from the rocky mountains called the dry line. so many things come together in america and we don t ha