Cloud suck

Paraglider pilots have reported being unable to descend in strong cloud suck, even after bringing their canopies into deep spiral, which would normally result in a rapid vertical descent.

[14] Compared with hang-gliders and paragliders, sailplanes have much higher top speeds (often over 250 km/h), and can more easily escape powerful cumulonimbus clouds by flying away quickly or by using very effective air brakes.

Cloud suck is also a concern for powered aircraft but is usually not a lethal hazard, except in extreme weather situations.

[6] The USS Shenandoah, the first rigid airship built in the United States, and the first in the world to be inflated with helium, was lost in a cloud suck accident associated with a squall line.

At about 6:00 AM on 3 September 1925, near Ava in northern Noble County, Ohio, the Shenandoah was suddenly caught in a violent updraft while at an altitude of 2,100 feet (640 m), rising at the rate of a meter per second.