Where does thunder come from?
Thunder comes from the flash of a 50,000°F lighting bolt (five times hotter than the sun). The surrounding air of lightning quickly heats and cools in fractions of a second. It’s this rapid expansion and contraction of the air that creates a compression wave we hear as the crackle of thunder.
Nearly 2000 thunderstorms occur at any time around the world with around 40 lightning strikes per second, or 3,500,000 lightning strikes every 24 hours.
You can hear thunder 5 to 12 miles from the starting point and the average length of a single lightning bolt is 2 to 4 miles.
The 30-30 Rule.
According to the National Oceanic and Atmospheric Administration, if you see lightning and hear thunder in under 30 seconds, lightning is close enough to hit you. It also recommends you to wait 30 minutes after a thunderstorm to safely leave your shelter. From weatherimagery.com
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