"I feel that as a society we all have the right to really know what is going on. "But experts say there is an easy explanation for the unique cloud formations. "TheseSydney's 7NEWS weather reporter Angie Asimus said. "In a westerly wind pattern, the air rises and cools as it goes over the mountains and then cools and condenses on the way down. "Although interesting to look at from the ground, Asimus warns the clouds could be trouble for air travellers.