Case in point, this video.
Anja Englert was driving down Irving Park Road in Chicago on Sunday evening during a torrential downpour. A line of thunderstorms was rolling across northern Illinois. Seemingly out of nowhere, a bolt of lightning comes crashing from the sky and shatters a wooden telephone pole in an explosion of flames and splinters right in front of the camera.
A severe thunderstorm warning was in effect at the time, but the truth is if you're outside during any thunderstorm, you won't get a warning before lightning strikes.
Nineteen people have died from lightning so far this year, and every one of them was preventable. We don't tell people to take shelter in a storm just because of tornadoes or strong winds; you risk being struck by lightning whenever you hear thunder.