Atmospheric phenomena are things that are not completely explained by normal science, they can be anything from Flying saucers to the Northern Lights. Anything that happens above the ground really can be categorized here.
“An Unidentified flying object (also called flying saucer and often abbreviated to UFO) is an...Unidentified Flying Object
“Animal rains have been recorded many times in history. Often the animals are fish, but rains or...Animal rains