Real Time Lightning Map
Domain: www.lightningmaps.org Shared: | Tags: interesting map weatherPart of the project Blitzortung.org, Lightning Maps plots a lightning strike by detecting electromagnetic discharges through a community of over 6000 stations across the world. You're able to build and setup your own station for roughly 250 euros and join the network.
I discovered this through Matt Webb's blog where they list a few other interesting maps.