不稳定气团是指在较低各层呈静力不稳定的气团。假如它的水分含量充沛，则在这种气团中会形成对流云和阵性降水等不稳定天气。
不管有没有梅雨锋的出现，从印度到库克群岛，日食路径都已嵌入潮湿和不稳定的气团中。
With or without the presence of the mei-yu front, the eclipse path is embedded in a humid and unstable airmass from India to the Cook Islands.
一种浓密、平底状的白色云块，有一个多重圆形的顶部和界线分明的轮廓，通常是由不稳定的热气团上升形成的。
A dense, white, fluffy, flat-based cloud with a multiple rounded top and a well-defined outline, usually formed by the ascent of thermally unstable air masses.
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