TORNADO HOW TORNADOES WORK HD FORMATION HOW A TORNADO FORM DIFFERENT ENGLISH ANIMATED DEMONSTRATION

Tornado Violently rotating column of air extending from within a thundercloud see Cloud down to ground level.
The strongest tornadoes may sweep houses from their foundations destroy brick buildings toss cars and school buses through the air and even lift railroad cars from their tracks.
Tornadoes vary in diameter from tens of meters to nearly 2 km 1 mi with an average diameter of about 50 m 160 ft.
Most tornadoes in the northern hemisphere create winds that blow counterclockwise around a center of extremely low atmospheric pressure.
In the southern hemisphere the winds generally blow clockwise.
Peak wind speeds can range from near 120 kmh 75 mph to almost 500 kmh 300 mph.
The forward motion of a tornado can range from a near standstill to almost 110 kmh 70 mph. A tornado becomes visible when a condensation funnel made of water vapor a funnel cloud forms in extreme low pressures or when the tornado lofts dust dirt and debris upward from the ground.
A mature tornado may be columnar or tilted narrow or broadsometimes so broad that it appears as if the parent thundercloud itself had descended to ground level.
Some tornadoes resemble a swaying elephants trunk.
Others especially very violent ones may break into several intense suction vorticesintense swirling masses of aireach of which rotates near the parent tornado.
A suction vortex may be only a few meters in diameter and thus can destroy one house while leaving a neighboring house relatively unscathed. Scientists study tornadoes to gain a better understanding of their formation behavior and structure.
Scientists who study tornadoes have a variety of powerful research tools at their disposal.
Advances in computer technology make it possible to simulate the thunderstorms that spawn tornadoes using computer models running on desktop computers.
Doppler radars which detect the rain in clouds allow meteorologists scientists who study weather to see the winds inside the storms that spawn tornadoes.
Modern video camera footage and reports from trained storm-spotters provide an unprecedented amount of high-quality tornado documentation.
These tools all contribute greatly to the scientific understanding of tornadoes.
This information may eventually lead to increased tornado warning times better guidelines for building construction especially schools and improved safety tips.
See also See also Meteorology. II FORMATION Many tornadoes including the strongest ones develop from a special type of thunderstorm known as a supercell.
A supercell is a long-lived rotating thunderstorm 10 to 16 km 6 to 10 mi in diameter that may last several hours travel hundreds of miles and produce several tornadoes.
Supercell tornadoes are often produced in sequence so that what appears to be a very long damage path from one tornado may actually be the result of a new tornado that forms in the area where the previous tornado died.
Sometimes tornado outbreaks occur and swarms of supercell storms may occur.
Each supercell may spawn a tornado or a sequence of tornadoes. The complete process of tornado formation in supercells is still debated among meteorologists.
Scientists generally agree that the first stage in tornado formation is an interaction between the storm updraft and the winds.
An updraft is a current of warm moist air that rises upward through the thunderstorm.
The updraft interacts with the winds which must change with height in favorable ways for the interaction to occur.
This interaction causes the updraft to rotate at the middle levels of the atmosphere.
The rotating updraft known as a mesocyclone stabilizes the thunderstorm and gives it its long-lived supercell characteristics.
The next stage is the development of a strong downdraft a current of cooler air that moves in a downward direction on the backside of the storm known as a rear-flank downdraft.
It is not clear whether the rear-flank downdraft is induced by rainfall or by pressure forces set up in the storm although it becomes progressively colder as the rain evaporates into it.
This cold air moves downward because it is denser than warm air.
The speed of the downdraft increases and the air plunges to the ground where it fans out at speeds that can exceed 160 kmh 100 mph.
The favored location for the development of a tornado is at the area between this rear-flank downdraft and the main storm updraft.
However the details of why a tornado should form there are still not clear. The same condensation process that creates tornadoes makes visible the generally weaker sea-going tornadoes called waterspouts.
Waterspouts occur most frequently in tropical waters.