Aerial views of the damage caused by Hurricane Sandy to the New Jersey coast taken during a search and rescue mission by Assault Helicopter Battalion, New Jersey Army National Guard, Oct. Air Force photo by Master Sgt.
A tornado usually first appears as a rotation in a huge thundercloud, often behind heavy rain or hail. The sky often turns green, yellow or black. The sound can be deafening, like the rumble of a freight train.
The monsoon trough is a portion of the Intertropical Convergence Zone as depicted by a line on a weather map showing the locations of minimum sea level pressure, and as such, is a convergence zone between the wind patterns of the southern and northern hemispheres.