A major cold front is expected to pass through Greece on Saturday, beginning in the north and edging south throughout the day, accompanied by freezing rain, snowfall and gale-force winds on the seas.
An urgently issued weather warning cited the prospect of snowfall as far south as the greater Athens area, with the mountainous regions in the country expected to be blanketed by snow.
Heavy rains are forecast for the southern Peloponnese and Crete, with most routes to the islands in the Aegean in danger of being cancelled.
In an urgent circular, the country's civil defense bureau urged local and regional government authorities to be on high alert against possible flooding, snowfall on roadways and areas, such as islands, that may be cut-off from transportation.
Conversely, Greece's ski resorts are looking forward to the wholesale arrival of the season's first sustained snowfall and blanketing.