full text of the classic FAA guide
HIGH ALTITUDE WEATHER
Many general aviation as well as air carrier and military aircraft routinely fly the upper troposphere and lower stratosphere. Weather phenomena of these higher altitudes include the tropopause, the jet stream, cirrus clouds, clear air turbulence, condensation trails, high altitude “haze” layers, and canopy static. This chapter explains these phenomena along with the high altitude aspects of the more common icing and thunderstorm hazards.