Note how this flash travelled to the east 40 KILOMETERS (~25 miles) in less than 1 second, and then struck the ground! (note distance on horizontal axis in upper left box, time is upper right box). The colored dots above represent the lightning channel of a cloud to ground lighning flash which struck in east central Florida. (This 3D lightning detection system is called "LDAR" see below). The image below is a "bolt from the blue" detected by a lightning detection system which observes lightning in 3 dimensions. Special thanks to Robert Prentice and Al Moller for allowing me to use their photos.īolts from the Blue as seen by lightning detection devices This is why it is a good idea to wait 30 minutes or more after the rain ends before resuming outdoor activities. This is why it is still dangerous to be outside when thunderstorms are in the region, the lightning can, and does, strike many miles away from the thunderstorm cloud itself. "Bolt from the Blue" lightning flashes are a very dangerous type of cloud to ground lightning flash, as they "appear" to come out of the clear sky. These lightning flashes have been documented to travel more than 25 miles away from the thunderstorm cloud (see the "LDAR" discussion below). A "Bolt from the Blue" is a cloud to ground lightning flash which typically comes out of the back side of the thunderstorm cloud, travels a relatively large distance in clear air away from the storm cloud, and then angles down and strikes the ground. The photos below are classic examples of 'Bolts from the Blue".
One of the most dangerous types of cloud to ground lightning
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