The alert comes into force at 9:00pm on Christmas Day and lasts until 6:00pm on Boxing Day.
It warns of potential travel disruption, mainly on higher routes, as wintry showers combine with some icy surfaces.
The warning area has been extended into more western and southern Scotland and the Northern Isles, with greater ice risk across western Scotland later in the night. The alert now covers Grampian, Strathclyde, Central, Tayside & Fife, The Highlands, Orkney and Shetland, Lothian and the Borders and south west Scotland.
The warning reads: “Strengthening west-northwesterly winds will bring increasingly frequent wintry showers to parts of Scotland through Sunday night and into Monday morning. These may fall as snow to low levels for a time where temporary accumulations of 1-3 cm are possible, with 5-10 cm of snow over the hills. Icy surfaces will be an additional hazard, especially across parts of Western Scotland later in the night where showers will fall as rain or sleet.
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