Como Cai a Neve?

A neve é uma forma de precipitação. Tudo começa quando o ar quente do solo, mais leve, encontra um ar mais frio acima e pode condensar o vapor d’água contido na forma de gotículas ou cristais de gelo, formando as nuvens.

As gotículas ou mesmo os cristais, estando em contínuo movimento dentro de uma nuvem, colidem entre si, formando gotas maiores ou aglomerados de cristais, que podem cair na forma de chuva ou neve, respectivamente, dependendo da temperatura do interior da nuvem e das condições atmosféricas durante a queda.

A neve se forma quando, nos níveis de nuvens em que ela tem origem, a temperatura chega abaixo de 0°C, transformando o vapor d’água em cristais de gelo ou flocos.

E é desta forma que ela cai. Mas se a temperatura entre a nuvem e o solo estiver elevada – acima de 4°C – a neve se derreterá durante a queda e se transformará em chuva. Quando a temperatura estiver na faixa entre alguns poucos graus negativos até 4°C, a neve cairá em grandes flocos, porque os flocos menores se combinam.

Muito abaixo de de 0°C, os flocos são pequenos. A neve recém-caída é branca e brilhante e de alto poder refletor, enquanto a que já caiu há algum tempo apresenta um tom amarelado.
A neve acumulada sobre o solo conserva a temperatura dele mais elevada do que se o chão estivesse descoberto.

Assim, em regiões agrícolas, ela protege as raízes das plantas, evitando o congelamento. Nas regiões de montanhas, a neve é importante para manter ou engrossar o fluxo dos rios, pelo seu degelo gradual, na primavera e verão.

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