Editing Cumulonimbus cloud (section)

=== Aviation ===
{{Main|Cumulonimbus and aviation}}
[[File:Cumulonimbo con pileus. Volando a 11.000 metros sobre Brasil.jpg|thumb|Aerial view of a cumulonimbus with pileus, flying over Brazil]]
Cumulonimbus are a notable hazard to aviation mostly due to potent wind currents but also reduced visibility and lightning, as well as [[atmospheric icing]] and hail if flying inside the cloud. Within and in the vicinity of thunderstorms there is significant [[turbulence]] and [[clear-air turbulence]] (particularly [[downwind]]), respectively. Wind shear within and under a cumulonimbus is often intense with [[downburst]]s being responsible for many accidents in earlier decades before training and technological [[Convective storm detection|detection]] and [[Nowcasting (meteorology)|nowcasting]] measures were implemented. A small form of downburst, the microburst, is the most often implicated in crashes because of their rapid onset and swift changes in wind and aerodynamic conditions over short distances. Most downbursts are associated with visible precipitation shafts, however, dry microbursts are generally invisible to the naked eye. At least one fatal commercial airline [[NLM CityHopper Flight 431|accident]] was associated with flying through a tornado.