If you look at a sky filled with cumulus, you may notice they have flat bases, which all lie at the same level. At this height, air from ground level has cooled to the dew point. Cumulus clouds do not generally rain – you're in for fine weather.
如果你看见天空布满了积云,你可能会注意到它们的底部都是平的,而且都位于同一水平线上。在这个高度,来自地面的空气已经冷却到露点。积云一般不会化成雨,它预示着好天气。
2. Cumulonimbus[,kjuməlo'nɪmbəs] 积雨云
While small Cumulus do not rain, if you notice Cumulus getting larger and extending higher into the atmosphere, it's a sign that intense rain is on the way. This is common in the summer, with morning Cumulus developing into deep Cumulonimbus (thunderstorm) clouds in the afternoon.
虽然小的积云不下雨,但如果你注意到积云变大并向大气高处延伸,这预示着强降雨即将到来。这在夏季很常见,早晨的积云到了下午可能就变成了厚厚的积雨云(雷雨)。
Near the ground, Cumulonimbus are well defined, but higher up they start to look wispy at the edges. This transition indicates that the cloud is no longer made of water droplets, but ice crystals. When gusts of wind blow water droplets outside the cloud, they rapidly evaporate in the drier environment, giving water clouds a very sharp edge.
靠近地表时,积雨云的边界都比较分明,但到了大气高处,它们的边缘开始出现条缕状。这种转变预示着云朵不再由水滴组成,而是由冰晶构成。当一阵阵的风吹动云朵外层的水滴,水滴在干旱环境下就会迅速蒸发,让云朵边缘看上去很尖锐。
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