I'd venture to guess it has to do with the earths weakening magnetic field. Different colored aurora borealis are being seen now, that have never been recorded before. New types of lightning discovered in the past couple years. All due to weakening field and the north and south magnetic poles flipping. This is just a guess based on what little I know about the world. If you're curious, look into the pole shift, and check out SuspiciousObservers.