Peculiarities of turbulence in a flow with vortices

In the atmospheric boundary layer there exist groups of roll vortices contr ibuting considerably to the momentum transfer, motion properties, etc. Ther e are data pointing to an important role of such vortices in the formation of such a dangerous extreme weather event (EWE) as a tornado. It is known t hat helical turbulence mode is the cause of the similarity of atmospheric a nd magnetohydrodynamic turbulence. To clarify the peculiarities of EWE orig ination, experimental studies of MHD turbulence were carried out under labo ratory conditions. (C) 2000 Published by Elsevier Science Ltd. AII rights r eserved.