求教：为啥美洲大陆常有灾害性龙卷风？

一场龙卷风导致近300人死亡，太可怕了。 I~S`'()J  
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东亚也常有龙卷风，但规模都很小。台风与龙卷风原理应该是一样的，可是在中国的台风影响范围都很大，但台风中心经过的地方破坏力好像没有那么大。 ,{c9Lv%@J  
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这两者的形成有啥区别呢？跟地理位置或海陆位置有啥关系呢？ n@BE*I<"  
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这个地理问题最终还是物理问题吧？ )2oWoZvi9  
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伤不起的物理男女们给通俗地解释一下可好？ J p .wg  
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http://pic.news.sohu.com/group-264455.shtml#0 ewgcpV|spn  
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好像跟大洋洋流有关。

我也想知道，什么原因？

Tornado Alley vD) LRO Z  
去找找这个电影. 一群追龙卷风的人.里面有一定的解释.

引用

引用第3楼notaq于04-29-2011 06:38发表的  : <4{@g]0RV  
Tornado Alley 2I?HBz1v  
去找找这个电影. 一群追龙卷风的人.里面有一定的解释. 'xStA  

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我看过几个，其中一个美女狂人都为此devorced了，很让老伍感动，但没找到答案。 qvYY
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这是一群做研究的人,他们的装备,方法都很有得看.八年最终在龙卷风里1分钟. {yt]7^  
我收到的信息是大片平地,冷气流挡住了热气流.... %/etoK  
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是什么使一个暴风雨变成一个灾难性的龙卷风,还需要很多研究分析他们追风人收集到的数据. dhK$XG  
这是我学到的. :)

http://www.nssl.noaa.gov/primer/tornado/tor_climatology.html  b1[U9  
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“Tornado Alley is a nickname for an area that consistently experiences a high frequency of tornadoes each year. The area that has the most strong and violent tornadoes includes eastern SD, NE, KS, OK. Northern TX, and eastern Colorado. The relatively flat land in the Great Plains allows cold dry polar air from Canada to meet warm moist tropical air from the Gulf of Mexico. A large number of tornadoes form when these two air masses meet, along a phenomenon known as a "dryline." “ ~d5"<`<^o  
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google 来得 d}l^yln  
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hurricanes, cyclones and typhoons are all the same.. the names differ in different locations.... &/JnAfmYqt  
these devastating storms are known as hurricanes in the atlantic side, typhoons in the pacific and cyclones in the indian oceans... the same is also known as baguio in the philippines (baguio and typhoon is interchangeable in the philippines) or willy-willy in australia... ]NFDE-Jz]  
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tornadoes are the very strong whirlwinds that suck everything up lying under its path... although it has the strongest wind its path is very narrow hence, its destruction is not much as compared to that of a hurricane, typhoon or cyclone where a single storm can cover hundred even thousands of kilometers ... r]HLO'<]  
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tsunamis are the very strong and fast ocean waves created by earthquakes that occured usually off shore... ]LSa(7>EU  
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Basically, hurricanes, tornadoes, cyclones and typhoons occur in the air while tsunamis occur in the water. Cg{$$&_(Hj  
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抱歉，详细的不知道。