Total darkness reigns across northern Europe amid harsh weather conditions . ( CNN ) -- Bad conditions have closed airports from Northern Ireland to Bulgaria . Cold temperatures are caused by Arctic air moving into southern latitudes . More snow is expected in the U.K. , Germany and France .
Total darkness reigns across northern Europe amid harsh weather conditions . Bad conditions have closed airports from Northern Ireland to Bulgaria . Cold temperatures are caused by Arctic air moving into southern latitudes . More snow is expected in the U.K. , Germany and France .