[lafroste]

I saw ball lightening once. It seemed to skip over the ground at a leisurely pace and lasted for maybe 2 seconds. It seemed bigger than 40 cm across (about 16"). I would have guessed maybe 2-3 feet. It was yellow and blue. It was very strange.

[Swordmaker]

I saw ball lightening once. It seemed to skip over the ground at a leisurely pace and lasted for maybe 2 seconds. It seemed bigger than 40 cm across (about 16"). I would have guessed maybe 2-3 feet. It was yellow and blue. It was very strange.

Several references I have read indicate BL can be from a 1/4" or smaller to several feet in diameter and can last from a fraction of a second to several minutes. Colors vary... probably related to the elements that were present with the plasmoid formed.