Whirlwind - what is a hose?

The tornado in Oklahoma earlier this week attracted the attention of the world by its devastating power. So what is a tornado? How is tornadoes formed?

>>>Whirlwind swept across the southern United States, 37 people died

What is a tornado (water cannon)?

According to meteorological dictionary, tornadoes are: "a fierce vortex of gas, sucking from the surface of the earth onto the cumulus cloud, forming a mobile funnel dangling from a cloud, looking like a hose ".

That is, in order for a vortex to be classified as a tornado, it must be exposed to the ground and the cloud.

How does the whirlwind form?

Tornado in Oklahoma

The classic answer is also the simplest - "The hot and humid air from the bay blows in cold and dry air from the mountain . " Many storms are formed from similar conditions but never, even near to create tornadoes. This fact has not been fully explained. That is why in Vietnam there has been no tornadoes like in the recent state of Oklahoma.

According to Wikipedia, tornadoes develop from a thunderstorm, usually from a very strong or super strong thunderstorm, so where there is intense thunderstorm there can be tornadoes, but fortunately it is rare. Sometimes it comes from a strong gust of wind (called sugars) or from a storm. It is thought that when the air in the cold upper layer overcomes the hot air below, the hot air will be forcefully moved up. But when tornadoes occur on the water surface, there is often no convection and no temperature difference between classes. So the cause of tornadoes has not fully understood.

However, most tornadoes are formed from a thundercloud form, especially charged thunder clouds. A cloud can last for several hours, swirling in an area of ​​10 to 16 km in diameter, moving hundreds of miles and generating countless giant smoking pipes. Their origins are climates with hot air flow up and cold air flow down.

The first is the process of interaction between thunderstorms and winds. This interaction will cause the lower gas layer to move upward and rotate in the air.

Next is the development of cold air flow moving in the direction of going down to the ground on the other side of the storm. The velocity of the downward air stream may be greater than 160km / h.

How long does a tornado last?

Tornadoes can last from a few seconds to over an hour. The longest tornado in history so far is not known because there are so many "longevity" tornadoes that have been recorded since the middle of the first half of the 20th century. less than 10 minutes.

The tornado in Oklahoma State has lasted more than 40 minutes.

What is the intensity of tornado F?

Dr. T. Theodore Fujita has developed a cyclone level discrimination system based on measuring the impact on buildings due to wind intensity.

The original F-scale F-scale was no longer used, instead an improved version. The cyclone wind speed in general is still a mystery and the first F-cale wind speed has never been tested and proven scientifically. Because the same damage may be due to different winds, depending on the structure of the quality work, the direction of the wind, the time it takes .

F-scale has been improved to rank the damage caused by tornadoes from F0-F5 based on criteria such as buildings, trees, building structures .

What does the sound of tornadoes sound like?

It depends on what the tornado attacks, how large it is or how strong or weak it is . The most common tornado sound is a continuous sound like the sound of a train coming. . Sometimes tornadoes produce loud noises like the sound of a waterfall falling or the noise opening a car window when the car is running extremely fast.