Tornadoes and Tornadoes.
A tornado (synonyms - tornado, thrombus, meso-hurricane) is a very strong rotating whirlwind with horizontal dimensions of less than 50 km and vertical dimensions of less than 10 km, with hurricane wind speeds of more than 33 m/s.
Tornado in the city of Nizhnevartovsk. 
tornado in Krasnozavodsk 
Strong winds, squalls and tornadoes... 
Tornado and lightning. 
Tornado in Surgut (September 4, 2008.
The form of tornadoes can be diverse, but most often tornadoes have the form of a rotating trunk, pipe or funnel hanging from the parent cloud (hence their names: tromb - in French pipe and tornado - in Spanish rotating).
THE ORIGIN OF A TWORKS
The occurrence of a tornado is also possible in clear, cloudless weather. The tornado has funnel-shaped extensions in the upper and lower parts. The air in a tornado rotates, as a rule, counterclockwise at a speed of up to 300 km / h, while it rises in a spiral upward, drawing in dust or water due to the resulting pressure difference. The air pressure in the tornado is reduced. The height of the sleeve can reach 800-1500 m, the diameter above water - tens of meters, and above land - hundreds of meters. The time of existence of a tornado is from several minutes to several hours. The length of the path is from hundreds of meters to tens of kilometers.
First, you can see a dark rotating funnel, then there is silence for a while, and then a tornado suddenly appears. The air in the tornado rotates counterclockwise and at the same time rises in a spiral, in contact with the Earth's surface, draws in dust, water and various objects. These destructions are associated with the action of rapidly rotating air and a sharp rise of air masses upwards. As a result of these phenomena, some objects (cars, light houses, building roofs, people and animals) can lift off the ground and be transported hundreds of meters.
Tornado in Surgut...
Tornado in Tolyatti. 
Tornadoes often appear in groups of two...
TORNADO
Tornado is a tornado of gigantic destructive power. The term is commonly used in the United States, comes from a distorted Spanish word "tronada", that is, a thunderstorm.
Tornadoes usually occur in the warm sector of a cyclone when, due to the action of a strong side wind, a collision of warm and cold air currents occurs. A tornado begins like an ordinary thunderstorm, often accompanied by rain and hail. 
tornado 6. 
Tornado
The wind speed in a tornado is so high that no anemometers can measure it. In the US, it is determined using Doppler radar. According to the speed of rotation of the air in the funnel, tornadoes are classified into six categories. The scale with six categories F0-F5 for classifying American tornadoes was introduced by Professor Theodore Fujita of the University of Chicago in 1971. Category F1 on the Fujita scale corresponds to 12 points on the Beaufort scale (32 m/s, hurricane). Fujita also introduced categories F6-F12 (from 142 m/s to the speed of sound), apparently just in case. But the recorded wind speed in a tornado has never exceeded the F5 category, it is assumed that such tornadoes will not be observed.
The reason for the formation of such powerful and frequent tornadoes in the United States is warm, moist air from the Gulf of Mexico.
ORIGIN OF TORNADO
The emergence of a tornado is an amazing mystery, for some reason there is surprisingly little information about the origin of these phenomena, but this phenomenon cannot be called small or insignificant. And the prediction of their appearances could be a significant achievement in general. In nature, the formation of vortices occurs all the time. Everyone has seen the formation of a funnel in the flowing water from the bath, marveling at the energy of the water as it forms.
Tornado. 2008-02-23. Welcoming summer. 
Japan hit by tornado: 9 dead. 
Tornado and Tornado. The inexplicable is the incredible.
TYPHOONS ARE A HAZARDOUS NATURAL PHENOMENON
These are also atmospheric vortices, but they are generated by tropical cyclones. A cyclone is an area of low pressure in the atmosphere with a minimum in the center.
Typhoon Morakot forced Taiwan's Defense Minister to resign.
The main area of occurrence of tropical cyclones is the water area of all oceans adjacent to the equator and enclosed between the parallels of 10-20 degrees north and south latitudes. A tropical cyclone is formed where the surface of the water has a high temperature (27°C and above), exceeding the temperature of the surrounding air by 2-3°C or more.
Typhoon Nuri paralyzed Hong Kong.
Lightning and Typhoons. 
Typhoon "Usagi" 
At the mercy of the cyclone 
Snow cyclone. 03/25/2010 00:04.
The tropical cyclone brought heavy rains to the states of India even before its arrival.
Typhoons are huge: their diameter (capture width) reaches 300-700 kilometers, and in some cases - up to 1000 km, height - from 5 to 15 km. Warm and humid air, rising up, forms rain clouds over the typhoon area, carrying a huge amount of water. The heavy rains brought by the typhoon last for hours and often lead to floods.
Typhoon Mina caused a mass evacuation of Filipinos. 
Philippine authorities prepare for Typhoon Lupit. 
Typhoon death toll in Vietnam rises to 74 
Typhoon Fengshen cost China $175 million. 