Actually, "looming" an appropriate word. loom luːm/ verb gerund or present participle: looming appear as a vague form, especially one that is large or threatening. "vehicles loomed out of the darkness" synonyms: emerge, appear, become visible, come into view, take shape, materialize,reveal itself, appear indistinctly, come to light, take on a threatening shape "ghostly shapes loomed out of the fog" (of an event regarded as threatening) seem about to happen. "there is a crisis looming" synonyms: be imminent, be on the horizon, impend, be impending, be close, be ominously close, threaten, be threatening, menace, brew, be just around the corner "without reforms, disaster looms"