: Virtually all significant weather, including 90% of all water vapor, is contained within the troposphere , the lowest layer of the atmosphere.
: Over the equator, the tropopause can reach heights of approximately 16 km with temperatures as low as -75°C to -80°C . In contrast, over the poles, it may be as low as 8 km with temperatures around -40°C to -45°C . 050 Meteorology (JAA ATPL theory).pdf
Understanding these divisions is vital because crossing the tropopause often means a transition into the , where air becomes extremely stable, vertical currents cease, and many weather hazards like thunderstorms are left below. : Virtually all significant weather, including 90% of
