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Intracloud lightnings over Toulouse (France). Original source is
Image,
About how many times faster
is light
than sound?
p. 1 Reference Table
About 1 million times
Gap between time you
see lightning and time you hear thunder tells ....
... distance of lightning
If time gap is small?
Lightning is close
Large gap of time?
Lightning far away
Did you know ...
Every 5 seconds gap = 1 mile
'...you can approximate the storm's
distance in miles by counting the seconds between the lightning
and thunder and dividing by five. It takes about
five seconds
for the sonic boom to travel one mile, so if you see the sky illuminated by a
streak of lightning and count 10 seconds until you hear the low
rumble of the thunder, the storm is about two miles away.'