Dipping temperatures and snowstorms across northern Greece yesterday cut off a number of villages and left others without electricity as technicians worked into the night to restore power and access to the remote areas. The central towns of Karditsa and Trikala, as well as Kozani and Grevena further north, were covered in snow yesterday. Officials in Grevena said that more than 5 centimeters of snow had fallen in the town. Twelve villages in the mountains around Grevena suffered power outages as a result of the snow and Public Power Corporation workers were last night trying to restore electricity. Access to some 40 villages in central and northern Greece was also blocked because of the heavy snow. The snowfall also caused problems on a number of country roads in western Macedonia, as well as on sections of the national road between Kozani and Ioannina, where vehicles needed snow chains. Officials said that the snow was up to 20 centimeters deep in some areas north of Kozani, making most country roads impassable.