This Web site, Blitzortung.org, tracks live lightning strikes, worldwide, and plots them online in real-time.
It’s totally cool.
If you read through the site, you’ll find out how they do it. People basically host a small kit, for free (and it’s worth only a couple hundred bucks), that is able to tell if lightning has struck up to several thousand miles away.
Yep, several thousands miles. I know.
Here’s an animated gif of the site, showing some live strikes over the US a few minutes ago:
But what’s really cool is to set it so that it shows you WHERE the lightning strikes were detected. You’ll see the distance is enormous — the lines track back to the various sensors that recognized the strikes. I mean, a sensor in Connecticut is seeing a strike in Cuba: