September - rain You are here: Home Photo gallery Clouds Contrails Shear (wing) funnels


Certain types of airplanes - the McDonnell Douglas DC-10 and MD-11 are notorious examples - create funnel clouds along their wings when the flaps are deployed, during the landing. The flaps induce a lateral (sideways) component of the airflow under the wing. When this air recombines with the air flowing over the wing backwards, the low pressure and rotational shearing causes a funnel cloud which extends several tens of meters behind the airplane. They can be quite spectacular when seen from the ground near a runway, in humid foggy weather. The funnel clouds cause extreme turbulence.

3 photos in gallery
Click images for large photos




w-415-13

w-415-12

w-415-10