how can you tell how far away lightning is
To determine how far away lightning is, you can use a simple method called the "flash-to-bang" method. Here’s how it works:
- See the lightning flash: When you see a lightning flash, start counting the seconds immediately.
- Hear the thunder: Wait for the thunder to arrive. When you hear the thunder, stop counting.
- Calculate the distance: For every 5 seconds you counted, the lightning is approximately 1 mile (1.6 kilometers) away.
This method works because light travels much faster than sound. When a lightning bolt strikes, it creates a bright flash of light that travels at approximately 186,000 miles per second (299,792 kilometers per second). The sound of the thunder, on the other hand, travels at approximately 768 miles per hour (1,236 kilometers per hour) at sea level.
By counting the time between the lightning flash and the thunder, you can estimate how far away the lightning is. Here’s a rough guide:
- 5 seconds or less: The lightning is within 1 mile (1.6 kilometers).
- 10 seconds: The lightning is approximately 2 miles (3.2 kilometers) away.
- 15 seconds: The lightning is approximately 3 miles (4.8 kilometers) away.
- 30 seconds: The lightning is approximately 6 miles (9.7 kilometers) away.
Keep in mind that this method is not always accurate, as the speed of sound can vary depending on atmospheric conditions, such as temperature and humidity. However, it can give you a rough estimate of how far away the lightning is.
It’s also important to note that if you see lightning and hear thunder within 30 seconds, it’s considered close enough to pose a threat. In this case, you should seek shelter immediately.
