Due to the enormous energy it releases and the accompanying meteorological phenomena, a thunderstorm is considered to be the most dangerous meteorological phenomenon for aviation.
It poses a danger above, below, beside and in the thundercloud itself. It is also dangerous for aircraft in the take-off or landing phase, but also for aircraft in the horizontal flight phase.
It can be caused by a single cloud or a cluster of clouds, which are called cumulonimbus clouds. They are most often formed overland in the summer and can grow up to 15 km in height, making flying difficult and dangerous, so pilots usually avoid them.
Many other hazardous meteorological phenomena accompany a thunderstorm: turbulence, strong wind, wind shear, strong updrafts and downdrafts, icing, electrical discharge, intense precipitation (rain, snow or hail), microbursts, gust fronts and funnel clouds.
Because of their significance for flight safety, the Aeronautical Meteorology Service pays special attention to thunderstorms by forecasting their formation and disappearance and providing a range of information for users.