A Storm Bert amber warning for snow has been extended in Scotland to cover the Borders, Dumfries and Galloway, East Ayrshire and South Lanarkshire.
The Met Office alert was already in place for parts of the Highlands, Aberdeenshire, Perth and Kinross and Angus.
Police Scotland has urged drivers not to take to the road on Saturday - with further yellow warnings for snow, wind and rain covering most of the country.
The amber warnings come into force at 07:00 with the weather likely to impact travel, events and power supplies in several areas.