A whirlwind usually occurs during the transition of the dry season to the rainy season or commonly referred to as the transition season. A whirlwind moves with a very high speed of an average of 170 km / hour and with a duration of 5 minutes. There are many names for this whirlwind / high-speed and destructive wind like lysus / leysus, then in Sumatra people used to call this wind the Bahorok Wind. But the most famous is the designation of wind Tornado with speeds up to 320 km / hour and has a diameter of 500 meters.
Most whirlwinds have speeds ranging from 180 km / h, with diameters of about 75 meters or 250 feet. But there are several types of whirlwinds that can reach speeds of 480 km / h and have a diameter of more than 1.5 kilometers and move along 100 kilometers.
When hot and cold air meet, they will bump into each other and form a tornado. In addition, it can also be caused by strong rising air currents in the clouds. And when it hasn't rained, the water droplets and ice crystals are still blocked by air currents rising to the top of the clouds.
Then during the day, very hot temperatures are then followed by black clouds that collect as a result of solar radiation. Clouds grow verically then inside these clouds the turbulence of air currents rises and falls at high speed. Air currents that descend at high speed is then what is then blown to the surface of the earth suddenly and ravage whatever it passes.
There are several signs of a whirlwind that we can learn, including:
If on the previous day, the temperature is very hot during the day and very cold at night but it does not rain, it should be wary of strong winds.
Observe the surroundings like tree leaves, do they move quickly, usually it won't be long before the rain and strong winds will arrive,
The air is cold / silir and the sky is pitch black, cloudy, dark black, and the trees sway.
The impacts caused by the tornado events are diverse and destructive. Starting from damaged houses, bridges collapsed, people's gardens were damaged, material losses, the fall of building debris and rubbish that were carried very scattered, causing casualties. Therefore, a tornado becomes very frightening if it occurs because it causes very severe damage.
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