Lightning almost never travels alone: it lives inside the convective cores you can see on radar, so a storm tracker doubles as a lightning map. When a cell near you turns orange or red, count the seconds between the flash and the thunder and divide by five — that is the distance in miles. Under ten seconds means the storm is within two miles and you should already be inside. The often-quoted rule from the National Weather Service is simple:
when thunder roars, go indoors, and wait thirty minutes after the last rumble before going back out. Lightning regularly strikes ten miles from the rain shaft, which is why blue sky overhead is no protection. For official warnings always check
active severe weather alerts, and for the storm's track open the
national radar or your
local radar near me.