Thunderstorms (Severe) » Severe Thunderstorm Preparedness
ID #1068
Estimating the Distance from a Thunderstorm

Because light travels much faster than sound, lightning flashes can be seen long before the resulting thunder is heard.
Estimate the number of miles you are from a thunderstorm by counting the number of seconds between a flash of lightning and the next clap of thunder. Divide this number by five.
Important: You are in danger from lightning if you can hear thunder. Knowing how far away a storm is does not mean that you're in danger only when the storm is overhead.
Last update: 2007-06-29 17:06
Author: Kai
Revision: 1.0
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