angry apocalypse beautiful cloud clouds colour creation cumulo nimbus cumulus danger glory image light Lightening lightning nature powerful rain clouds silhouette skies sky storm storm front stormy threatening thunder thunderhead weather wild evening looming menace menacing omen ominous darkness deluge gray grey judgement violent field grass mustard plains prairie rain ribbon wind background Indian Ocean ocean sea skyscape wallpaper water America bushes dead landscape south tree trees boats colors moody mountains sand shoreline Nyberg raining blue fierce malignant summer black foreboding gather imminent violence