I just got back from vacation in Florida and a highlight was a glowing cloud that came overhead Monday night. We were walking back from one of the St Pete beaches after sunset and one of the approaching clouds was glowing blue. It looked like a normal thunderstorm, other than for that blue glow. Pretty soon we started hearing thunder and there were frequent flashes of lightning inside the cloud and there were a few external lightning bolts per minute. Some of those were huge and one was a capital H reaching from the top of the cloud, with the crosspiece being just beneath the cloud. Throughout that time, the cloud never lost that steady blue glow, except for having localized flashes of cloud lightning. We watched it for a long time and the blue glow eventually faded until the cloud looked like the surrounding anvil clouds and the lightning stopped. Did we stumble onto the set of an alien invasion movie? We didn't see any obvious little green men but, being in Florida, they'd probably blend in. Especially during the earlybird special at a strip mall restaurant. Has anyone seen something like that and, better still, can someone explain that steady blue glow?