Well freak storms and weather events like portrayed in the day after tomorrow arent entirely out of the realm of possibility. After all, the history of the earth shows us what such freak world wide weather events can do to shape the face of our planet. For example. the time it rained 2 million years which gave earth its oceans.

​https://www.reddit.com/r/movies/comments/14geifk/how_accuretly_did_the_movie_day_after_tomorrow/