A significant weather change is expected across Greece on Friday as cold air masses from the Balkans move in. The incoming system will bring strong atmospheric instability, resulting in thunderstorms and hail, particularly in certain regions. Temperatures are forecast to drop noticeably as a result of the cold front. Authorities have not yet specified the exact areas most at risk, but residents should prepare for potentially disruptive conditions. The forecast indicates a shift from recent warmer weather to a more unsettled pattern. This change is expected to be impactful, prompting a need for vigilance and preparedness.