How far away was the last lightning flash in your local area ?
Start Timer when you see Lightning flash - Stop Timer when you hear Thunder.
Sound travels about 1.72 kilometres or 1 mile in 5 seconds. Count the seconds from when you see a flash and hear the Thunder
and then divide by 5 to get an estimate of the distance or use this calculator to determine how far away lightning really is:
However it is not recommeded to use your computer whilst there is Lightning activity in your area.