Cumulus clouds, rain clouds, thunderstorm clouds, approaching thunderstorm

ambiance ambient approaching atmosphere atmospheric cast cloud clouded clouds cloudy colored coloured cumulus cumulus dark dark colored dark coloured darkly dramatic dramatically drearily dreary dusky filled formation formations full gloomy gloomyly head heads mood mood filled moods nebulous of over over cast overcast rain shadily shady sky stormy thunder thundercloud thunderclouds thunderhead thunderheads thunderstorm thundery