A cyclonically rotating vortex, around 2â€“10 km in diameter, in a convective storm. The vorticity associated with a mesocyclone is often on the order of 10âˆ’2 sâˆ’1 or greater. (It should be noted that a mesocyclone is not just any cyclone on the mesoscale; it refers specifically to cyclones within convective storms.) Mesocyclones are frequently found in conjunction with updrafts in supercells. Tornadoes sometimes form in mesocyclones. Persistent mesocyclones that have significant vertical extent are detected by Doppler radar as mesocyclone signatures. Tornado warnings may be issued when a mesocyclone signature is detected.
The cyclonic, rotating part of a large thunderstorm. Tornados are usually formed in association with the mesocyclone.
a vertical cylinder of rotating air that develops in the updraft of a severe thunderstorm which is formed when the updraft spins in a counter clockwise direction