By the height and how thick it's.
Clouds form when water starts to condense, so clouds eventually grow until they rain themselves to death-clouds mean rain.
Altitude and shape.
Meteorologists classify tornadoes on the Enhanced Fujita Scale based on the severity of the damage they cause with EF0 being the weakest and EF5 being the strongest.
Cumulonimbus Horse Isle Answer: cumulonimbi
white and fluffy