The phrase "impending danger" means that there is a dangerous situation that is about to happen or occur soon.
Sentences with «impending danger»
You'll usually interact with other players by leaving them messages, or reading theirs, to warn of impending dangers or point them toward hidden treasure. (tomsguide.com)
In case of impending danger u have control to keep them safe.. (babycenter.com)
They have a highly developed sense of smell, and also seem to have a sixth sense about impending danger from storms and avalanches. (wagbrag.com)