We have a particularly heavy rainstorm going on this afternoon (and it's still going as i'm posting right now)
Most of you have wondered after hearing a deafening boom of thunder, 'how close was that last thunderbolt?'
Well, here's a simple method of determining the distance from lightning (courtesy of Wikihow):
1. Watch the sky for a flash of lightning.
2. Count the number of seconds until you hear thunder. If you have a watch with a second hand or a digital watch that has seconds, begin timing as soon as you see the lightning and stop as soon as you hear the thunder start. If you don’t have a watch, do your best to count the seconds accurately. Say "One one thousand, two one thousand etc." in your mind for each second.
3. Divide the number of seconds by 5 to calculate the distance in miles (or divide by 3 for kilometers). In other words if you counted 18 seconds from when you saw the lightning, the strike was 3.6 miles (6 kilometers) from your location. The delay between when you see lightning and when you hear thunder occurs because sound travels much, much more slowly than light.
So with that formula..A flash of lightning, followed by a long delay for the thunder.- the lightning struck relatively far away.
A flash of lightning, followed by a short delay for the thunder.- the lightning struck somewhere close to you.
A flash of lightning, followed immediately by thunder.- HOLYCRAP that scared the shit out of me! Really close, probably one of the adjacent buildings or your building. (this happened to me 5 minutes ago. i jumped, literally.)
A flash of lightning...- Damn buddy you got thunderstruck, better rest for a while while your fried body recuperates from the incident. Nice hair by the way.