The sinister atmosphere of the place left an indelible imprint on my memory.

此处不祥的氛围在我的记忆了不可磨灭的印记。

I felt a gloomy foreboding that something was going to go wrong.

我有一种不祥的预感，总觉得要出事。

The unusually heavy rainfall was an ill omen for the travellers.

异乎寻的大雨是旅行者的不祥之兆。