Our weather - with some occasional "excursions"- occurs in the troposphere. The top of the trope varies depending on temp and a couple of other factors, from about 31K' to about 45K'. You know you're in the trope because temps tend to decrease as you get higher.
When that stops, you're getting in to the stratosphere. There is still "air" up there (sheesh!), but now the temps increase as you get higher.
Some weather can bust the trope, with enough energy, but it's not the rule.
That's your free one. From here on out you should use this cool new thing called the "internet".