A rare phenomenon over the city of Kavala in Northern Greece: A storm with a shelf cloud. A low-hanging, well-defined, wedge-shaped formation that occurs along the leading edge of a gust front in a thunderstorm. Shelf clouds most often form just ahead of intense lines of thunderstorms. Shelf clouds are considered as one of the … The post Rare phenomenon over Kavala: An awesome Shelf Cloud appeared first on Keep Talking Greece.