Como se forma um tornado?
Autor: Grupo Verde | Publicado: 2012-04-26T14:29:00-03:00

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&nbsp;Primeiramente, tornado é uma coluna de ar em
rotação acelerada cujo centro apresenta pressão extremamente baixa. São comuns
na primavera e no começo do verão, em ambientes quentes e úmidos, sobretudo nas
grandes planícies americanas.



Mesmo que todos os detalhes
ainda não sejam conhecidos, os meteorologistas possuem ideias gerais de como o
processo começa. Como os tornados ocorrem mais frequentemente quando estão presentes tempestades, é lógico supor que as condições necessárias
para a formação das tempestades são também favoráveis para os tornados, assim,
em ambientes quentes e úmidos.



Uma nuvem em funil é
comumente a observação do início de um tornado. Se por acaso atingir o solo,
ela passa para a próxima fase e é oficialmente designada como um tornado. As
paredes de um tornado não são sempre visíveis (como as nuvens), mas são frequentemente
definidas pelos detritos e poeira que sugam até o vórtex.



Quando o funil de um tornado
atinge sua largura máxima, algo entre 15 metros e alguns quilômetros, e está
perpendicular ao solo, o tornado passa para sua terceira fase e pode ser
chamado de tornado maduro. Um tornado maduro é um tornado em sua fase mais
violenta, destruindo praticamente tudo em seu caminho.






A intensidade dos tornados é classificada na escala Fujita&nbsp; que vai de F0 até F6, sendo o F0 o mais fraco e o F6 o mais forte. Atualmente,
 existe uma nova versão da escala Fujita, a escala Fujita melhorada, que
 vai de F0 a F5. Tornados com intensidade F5 são muito raros de se 
observar enquanto tornados F6, apesar de ser aceitado na escala Fujita 
convencional, são apenas hipotéticos. A coloração
 cinza ou “amarronzada” dos tornados ocorre devido aos detritos e poeira
 que ele desloca. Quando ocorre sobre uma porção grande de água (mar, 
lagos ou grandes rios), o fênomeno recebe o nome de tromba de água.



A maior parte dos tornados mais destruidores do mundo acontece nos  
Estados Unidos, mas os  tornados também causam danos violentos e 
destrutivos em outros países ao redor do mundo.


Fonte:

http://www.sitedecuriosidades.com/curiosidade/a-curiosa-formacao-dos-tornados.html

http://www.blogsilence.com/os-10-tornados-mais-destruidores-da_08/









Milena Brique 

&nbsp;