All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 143 6 1
PDF Downloads 7 3 0

A Non-Thermal Mechanism for Forcing Cumulonimbus Cloud

James ConnellUniversity of Tennessee Space Institute, Tullahoma 37388

Search for other papers by James Connell in
Current site
Google Scholar
PubMed
Close
Restricted access

Abstract

Within the thunderstorm there is an extensive region of collision between airflows having different transports of momentum. The inflow-updraft should interact with cloud layer environmental wind to produce counter-rotating vortex pairs somewhat like those produced in the laboratory by a jet in a crossflow. Atmospheric evidence of vortex pairs for severe thunderstorms is shown from measurements made by aircraft and by radar.

A model of a non-thermal mechanism for low pressure centers in thunderstorms is developed which scales from the laboratory to the atmosphere using a turbulence Reynolds number, a velocity ratio and the diameter of the updraft. Central pressure deficits and vorticity of lee vortices scaled up from the laboratory observations are consistent with the few available thunderstorm measurements.

The model is used to explain deviate motion of thunderstorms as well as to suggest a mechanism for tornado development and movement.

Abstract

Within the thunderstorm there is an extensive region of collision between airflows having different transports of momentum. The inflow-updraft should interact with cloud layer environmental wind to produce counter-rotating vortex pairs somewhat like those produced in the laboratory by a jet in a crossflow. Atmospheric evidence of vortex pairs for severe thunderstorms is shown from measurements made by aircraft and by radar.

A model of a non-thermal mechanism for low pressure centers in thunderstorms is developed which scales from the laboratory to the atmosphere using a turbulence Reynolds number, a velocity ratio and the diameter of the updraft. Central pressure deficits and vorticity of lee vortices scaled up from the laboratory observations are consistent with the few available thunderstorm measurements.

The model is used to explain deviate motion of thunderstorms as well as to suggest a mechanism for tornado development and movement.

Save