You might also like. Read more. A convergence line is a band of cloud that remains fairly stationary and can produce large amounts of rain across a relatively small area. In this article we take a quick look at what exactly is meant by phrases like 'summer showers' and 'sunshine and showers'. Help us improve our website Take our short survey. Lightning is a discharge of electricity. This extreme heating causes the air to expand explosively fast. The expansion creates a shock wave that turns into a booming sound wave, known as thunder.
As ice crystals high within a thunderstorm cloud flow up and down in the turbulent air, they crash into each other. Small negatively charged particles called electrons are knocked off some ice and added to other ice as they crash past each other. The top of the cloud becomes positively charged while the base of the cloud becomes negatively charged.
Image: American Red Cross. Get smart. Sign Up. Support science journalism. Knowledge awaits. See Subscription Options Already a subscriber? Create Account See Subscription Options. The loud boom that you sometimes hear is created by the main lightning channel as it reaches the ground. Since you see lightning immediately and it takes the sound of thunder about 5 seconds to travel a mile, you can calculate the distance between you and the lightning.
Keep in mind that you should be in a safe place while counting. Remember, if you can hear thunder, chances are that you're within striking distance of the storm.
You don't want to get struck by the next flash of lightning.
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