Literal meaning that weather is unpredictable; used to mean that human life is full of sudden changes or misfortunes. First half of a couplet, usually followed by [[人有旦夕祸福|人有旦夕禍福|ren2 you3 dan4 xi1 huo4 fu2]]

an unexpected calamity or catastrophe, often used in literary contexts to refer to a sudden death

To narrowly escape a life-threatening accident or disaster; to come close to an unfortunate death

describes a situation where things change as unexpectedly as the wind and clouds; used to describe sudden and unpredictable changes or misfortunes

something so magical or ingenious that even gods and spirits cannot fathom it; unpredictable and mysterious; beyond human understanding

(idiom) a succession of misfortunes has occurred; to suffer one mishap after another

Fortune is as unpredictable as the weather, and every day may bring luck or disaster; used to express that something unexpected may happen at any moment.

be prepared against any eventualities or unexpected accidents

Unexpected misfortune or calamity; often used in the saying [[天有不测风云，人有旦夕祸福|天有不測風雲，人有旦夕禍福|tian1 you3 bu4 ce4 feng1 yun2 ren2 you3 dan4 xi1 huo4 fu2]] to describe the unpredictability of life.