龙卷风英文版ppt

1、TornadTornado oby zhaoliForm1) the instability of the atmosphere to produce a strong updraft , because of the rapids in the largest transit airflow, it is further strengthened.2) due to the updraft begins to rotate in the middle of the troposphere, the formation of the meso-scale cyclone with wind s

2、peed and direction are in the vertical direction shear interaction.3)With the development of mesoscale cyclones to the ground and upward stretch itself thinner and enhanced. At the same time, a small area of enhanced auxiliary co-nascent tornado is formed inside the cyclone, resulting in the same pr

3、ocess of the cyclone, the formation of the tornado core.4) different the tornadoes core rotation and cyclones, its strength is enough to make the tornado has been extended to the ground. Development of the vortex reaches the ground level, the surface pressure sharply decreased, a sharp increase in s

4、urface wind speed, the formation of tornadoes PicturesTypeslandspoutmultiple vortex tornadowaterspoutTornadoLandspoutcharacteristicsrelative weaknessshort lifespan a small, smoothcondensation funnel Multiple vortex tornado A multiple-vortex tornado is a tornado that contains several vortices rotatin

5、g around, inside of, and as part of the main vortex.The only times multiple vortices may be visible are when the tornado is first forming or when condensation and debris is balanced enough so that subvortices are apparent without being obscured. WaterspoutA waterspout is defined by the National Weat

6、her Service as a tornado over water. They form at the bases of cumulus congestus clouds over tropical and subtropical waters. They have relatively weak winds, smooth laminar walls, and typically travel very slowly. They occur most commonly in the Florida Keys and in the northern Adriatic Sea. In con

7、trast, tornadic waterspouts are stronger tornadoes over water. There are many damages. the car was blown over, trees were uprooted, roofs and walls were blown away with this series Tornado damageat home, be sure to stay away from doors, windows and housing peripheral wall, hide your head squat torna

8、do direction opposite walls or small rooms. To escape the tornado safe place is the basement or semi-basement.The opposition having an affair tornado, you should find the nearest low-lying land volts on the ground, but to stay away from trees, poles , so as not smashed, pressure and electric shock .Preventcar go out to encounter a tornado, do not drive a car to escape, and do not in the car to avoid car tornado almost no defense, you should immediately leave the car to the low-lying ground to escape. In