about to happen, approaching, brewing, close, coming, expectant, fast-approaching, following, forthcoming, gathering, handwriting-on-the-wall, immediate, impending, ineluctable, inescapable,...
almost
There are books for synonyms like dictionaries or simply do a search on the Net. Synonym for imminent, will get you all you need.
approaching, forthcoming, close, nearing, following, inevitable, unavoidable
Both are correct.