Lightning is a bright flash of electricity produced by a thunderstorm. All thunderstorms produce lightning and are very dangerous. If you hear the sound of thunder, then you are in danger from lightning. Lightning kills and injures more people each year than hurricanes or tornadoes; between 75 to 100 people.
Several tornadoes touched down in Oklahoma during spring storms that resulted in ominous cloud formation on May 18, according to reports. This spectacular video recorded by Mary Brinkley shows lightning shooting across the sky in Norman, Oklahoma.
Watch closely and you will see the step leaders heading down from the cloud. These are rarely visible and last only a few thousandths of a second. Note that one reaches the ground and this is the path that the much brighter lightning bolt follows.