How Fast Does Lightning Go?

Tools

By By Steve Pool

SEATTLE - Lightning bolts move at incredible speeds. As for the exact speed, while researching the question on the Internet, we've found conflicting answers, ranging from the speed of light to several thousand miles per second.

But the best answer we've had so far is from Bruce Steo, who says lightning actually goes at variable speeds, because it is not just light, but electron plasma moving through charged air. Its can depend on air conditions, but the typical lightning bolt moves at 224,000 mph -- or about 3,700 miles per second.

However, the light you see from the lightning obviously travels at the speed of light, which is roughly 670 million mph, or 186,000 miles per second.

Thunder travels much slower -- at the speed of sound, which generally is about 760 mph.

Thus, you can figure how far you are from the lightning strike by timing the pause between seeing the flash and hearing the thunder.

Every 5 seconds equals one mile in distance. So 10 seconds between seeing the bolt and hearing the thunder means you're 2 miles away.

Your Photos

YouNews Up! Up! And away! Up! Up! And away!
When I saw this dramatic cloud to the north, it reminded me of smoke, rising in billows until it hits the jet stream, then it's pulled hundreds of miles east. I had to capture it quickly. Within minutes the effect had faded.
YouNews Inside an osprey nest Inside an osprey nest
For my girlfriends birthday we had a party at her parents. We knew the nest was there but the owner hadn't seen or heard the osprey for a day or two. He asked me to fly my drone up and see if any was wrong. I flew up and found that there were two eggs inside.
YouNews Our Garden Our Garden
The growing season has been great.

The secret to this garden is simple.
I used recycled grass clippings.