Of a sample of 130 cases of ball lightning observed since 1986, none of the plasmas lasted much longer than 10-15 seconds and many even less than that. They explain very few UFO reports for that reason. It would be almost impossible to confuse this with the kind of UFO cases I posted on here.
"The very short duration of ball lightning reflects its instability. In 34 % of the reported cases, the objects were only visible 1-3 seconds; 24% of the reports speak of a permanence of 3-5 seconds, and 19.5 % of 5-10 seconds."
About 70% of these ball lightning cases are reported in the summer months as well.
Edited by TheMacGuffin, 24 November 2012 - 04:35 AM.