The Alps expect heavy cloud over the weekend with light snow flurries and strong winds.

阿尔卑斯山预计周末是多云，有小阵雪和强风。

《柯林斯英汉双解大词典》

No wind and Heavy cloud.

没有风，云层很厚。

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The heavy cloud of disappointment seemed to hang over the whole proceedings.

失望的阴云似乎笼罩着整个过程。

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Any ambient starlight or moonglow is diffused by heavy cloud, and the road is simply too twisty to get any solid idea of direction.

BBC: In search of the perfect road in Mallorca

But heavy cloud ruined the event for many UK skywatchers.

BBC: You are in: Sci/Tech

These systems must be smart enough to independently switch back and forth from solar when the sun is out to fuel at night or when there is heavy cloud cover.

ENGADGET: Marines eye solar energy to eliminate dependency on fuel generators (video)