According to the American Meteorological Society's official definition, a tornado is "a violently rotating column of air, pendant from a cumuliform cloud or underneath a cumuliform cloud, and often (but not always) visible as a funnel cloud".
The damage in Central Park, he said, was caused by strong wind, not the violently rotating columns of air characteristic of tornadoes.
Tornadoes are generally defined as rotating columns of air characterized by small size, axisymmetry and short duration.
Tornadoes, violently rotating columns of air spawned by thunderstorms, occur when available energy — warm, moist air at low levels and cold, drier air above — meets vertical wind shear, which provides the source of the rotation.
The National Oceanographic and Atmospheric Administration (NOAA) website notes that a tornado is a narrow and violently rotating column of air that extends from the base of a thunderstorm to the ground.
Some fundamentals concerning the operation of PFCs as rotating columns are given in the paper.
This leads to a flow pattern organized into rotating columns that run parallel to the rotation axis through the height of the container.
The International Institute of Welding (IIW), in 1984, divided spray arc types into the three categories: (i) drop spray or projected spray, (ii) rotating spray, and (iii) streaming spray (Iordachescu and Quintino 2008; Lancaster 1986).
A typical coater consists of a vertical axis cylindrical vessel with a rotating base and a spray disc in the centre, onto which the coating liquid is fed to atomise and spray-coat the seeds.
This is because the tubes, jets and rotating devices spray water outward from the center; down and outward from the top; and, up and outward from the bottom of the dishwasher.
Since the images of the 3rd column were generated by rotating the images of the 1st column through the bicubic interpolation, the edge-maps were very similar for these two image sets.
