Most tornadoes have wind speeds of 177 km / h or more with an average reach of 75 m and employ several kilometers before dissipating. Several tornadoes that reached wind speeds of 300-480 km / h stretch more than a mile (1.6 km) and can survive on surfaces with more than 100 km.
Although tornadoes have been observed on every continent except Antarctica, tornadoes are more common in the United States. Tornadoes are also commonly occur in southern Canada, south-central and eastern Asia, east-central South America, South Africa, northwest and central European, Italian, western and southeastern Australia, and New Zealand.
Definition.
Tornado is defined by the Glossary of Meteorology as a "fast rotating column of air that is fused to the surface of the soil and emerge from cumuliform cloud or cumuliform cloud bottom and often (but not always) visible as a funnel cloud ..."The condensation funnel.
Tornado does not have to appear; however, the intensity of low pressure caused by high wind speeds (see Bernoulli's principle) and fast spin (related to balance siklostrofik) often causes the water vapor in the air condenses which causes visible condensation funnel. Tornado is a whirlwind not cloud condensation.an embodiment of a funnel cloud condensation funnel without the strong winds at the surface. Not all funnel cloud becomes a tornado. However, many tornadoes are preceded by a funnel-like vortex mesosiklon cloud that land on the surface of the ground. Tornado generally produce strong winds at the surface when the funnel looks that survive above ground level. This causes difficulty in finding the difference between a funnel cloud and a tornado from a certain distance.
Tornado family.
Sometimes, a single storm produces various tornadoes and mesosiklon. This process is known as Tornadogenesis cycle. Tornadoes are formed from the same storm known as a family tornado. Sometimes some of mesosiklon different tornadoes occur simultaneously.Tornado attack.
Sometimes, several tornadoes formed from a large-scale system bada same. If there is a devastating tornado activity, it is considered to be a tornado strike, although there are various definitions. A period of several days in a row with a tornado in the same location (formed by multiple weather systems) is a tornado barrage of attacks, sometimes called wide tornado attack.Etymology.
The word "tornado" is an alteration of the word in Spanish tronada, which means "lightning storm". Then, said tornadoes were also taken from the Latin tonare, which means "rumble". This word is very likely a combination of the Spanish language tronada and tornar ("spin"); however, this word may also be a folk etymology. Tornadoes are also commonly known as Twisters.Type.
Multi-vortex tornado.
Multi-vortex tornado is a type of tornado in which two or more rotating column of air that coagulates around the center. Multi-vortex structures can occur in almost any circulation, but it is often observed in the devastating tornado.Satellite tornado.
Satellite tornado is a term for a weak tornado formed near large powerful tornado that occurred in the same mesosiklon. Satellite tornado emerged from the "orbit" large tornado (as the name suggests), showing the form of multi-vortex vortex. However, a satellite tornado is a distinct funnel, and smaller than the main funnel.Tornado.
Tornado officially described briefly by the US National Weather Service as a tornado passing through the waters. However, researchers generally characterize tornado "weather being" derived from the tornado tornado.Waterspout weather is a little destroyer but very far from the generally and has a dynamic similar to dust devils and landspout. They are formed when the row congestus cumulus clouds towering in tropical and semitropical waters. These winds have relatively weak winds, smooth-coated walls, and generally drove very slowly. These winds are very common in the Florida Keys.
Tornado Tornado is a literal term for "tornado that crossed the waters". This wind can be formed across the water like a tornado mesosiklon, or be ground tornado passing out water. Since this wind is formed of thunderstorms destroyer and can be much more powerful, faster, and last longer than the tornado weather is, the wind is considered far more dangerous.
Why of Tornado.
Tornado comes from Tronada (Spain), Tonare (Latin) and is often known as the Twister and Willy-willy. From the definition of a tornado can be interpreted as a strong rotation of an air column formed from cumuliform cloud that has touched the ground, usually appears as a funnel cloud (funnel cloud), and is often accompanied by wind and rain storms, lightning or hail. Most tornadoes are caused by thunderstorms rotating with regular circulation called mesosiklon.The formation of tornadoes are generally visible on the things that happen on a scale of storm, in and around mesosiklon. Differences in temperature at the edge of the descending air masses located around mesosiklon (downdraft occlusion) is closely related to the growth of a tornado. Most tornadoes can have a speed of over 480 km / h, an average of 175 km / h or more (around the center can reach 100-200 meters / hour), with a height of ± 75 m, diameter typically ranges from tens to hundreds of meters , Generally occur at noon until late afternoon.
In the United States tornadoes often occur between 15-21 LT. In the northern hemisphere the majority of tornadoes swirling anti clockwise, the opposite in the southern hemisphere whirls clockwise. Tornado duration time is usually only a few minutes (less than 10 minutes), the longest not more than a few hours.
Tornadoes can occur anywhere in a place in the world, but in areas of high latitude occurrence usually in the spring or summer. The United States has the intensity of a tornado occurrence are higher than other areas, particularly in the Central-Western American. In Indonesia, more tornadoes occurred around Sumatra and Java. Tornado can be classified based on the type and scale of damage.
By type, tornado distinguished by:
1) Weak Tornado.
Thus categorized due course of a very short time between 1 to 10 minutes or more, most have a small size with destructive power generally small-scale F0-F1 and wind speed less than 112 mph. The percentage of the number of deaths caused by a weak tornado is less than 5% of the total deaths caused by tornadoes. This type of most of the other types, covering 88% of the total incidence of tornadoes.2) Strong Tornado.
Lasted 20 minutes or even more, generally measuring approximately 10 m with a strong destructive power - scale F2 - F3 - as well as the wind speed between 113-206 mph. Deaths caused by this tornado include up to 30%. Strong tornadoes covers 11% of the total number of occurrences of tornadoes.3) Violent Tornado.
This tornado can last long enough to exceed 1 hour and can traverse many miles before disappearing with the destructive power of very strong - F4 - F5 - and winds of more than 205 mph. This type is most widely claimed lives of 70% of the total deaths. Very rare that only covers 1% of the total number of occurrences of tornadoes.The issue of global warming on the rise again moments today. A number of facts prove that our world nowadays, it has experienced an increase in temperature, global climate change, compared with the previous period. This is also a possible cause worsening weather conditions in nearly all the countries that one consequence is the increasing incidence of tornado intensity compared to previous years.
Thank you for reading this article. Written and posted by Bambang Sunarno. sunarnobambang86@gmail.com
author:
https://plus.google.com/105319704331231770941.
name: Bambang Sunarno.
http://primadonablog.blogspot.com/2015/12/about-tornado.html
Published Date: December 2, 2015 at 08:45
Tag : About Tornado.
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