Funnel Cloud or Tornado? Print
Written by Administrator   
Saturday, 21 August 2010 07:59

Cold-air funnel clouds (vortices) are usually short-lived and generally much weaker than the vortices produced by supercells. Although cold-air funnels rarely make ground contact, they may touch down briefly and become weak tornadoes or waterspouts.

Unlike the related phenomenon associated with severe thunderstorms, cold-air funnels are generally associated with partly cloudy skies in the wake of cold fronts, where atmospheric instability and moisture is sufficient to support towering cumulus clouds but not precipitation. The mixing of cooler air in the lower troposphere with air flowing in a different direction in the middle troposphere causes the rotation on a horizontal axis, which, when deflected vertically by atmospheric conditions, can become a funnel cloud.


The following photographs were taken by Jane McDonough of Latheron while out on a boat on the evening of 10th August 2010.





A great set of images that shows the dissipation of the funnel and some good detail while it is at it's largest.

Thank you so very much again Jane for donating them to this website.