Red light observed under a thundercloud, stationary for a few seconds, then went straight down and changed from red to white.A thunderstorm was forming, no rain yet, a red light was observed below the cloud and was stationary for a few seconds, then it fell straight down, disappeared, and reappeared and turned white, then fell below the tree line.((NUFORC Note: This report was submitted on behalf of the eyewitness, who is very experienced in the airline industry, and who wishes to remain totally anonymous. The person who wrote the report has worked in the aerospace industry for many decades. PD))