Despite a lack of snow, it was bitterly cold and windy in southern parts of the United Kingdom, with ice expected and temperatures unlikely to go above -1C in London on Tuesday night.
Police Scotland warned there is a "high risk" of disruption and urged people to drive to the conditions.
Superintendent Graeme Galloway from Police Scotland said: "The issue of another Amber Warning for our area means that once again resources are likely to be at full stretch tonight trying to keep our roads open".
The Met Office warning for heavy rain across Northern Ireland on Sunday.
"Travel delays on roads are likely, as are public transport cancellations".
Further weather warnings for snow and ice have been issued for Derbyshire this weekend by the Met Office.
The "be prepared" alert is in place for wide parts of the country, including Strathclyde, Central, the Lothians, south west Scotland, Tayside and Fife from 07:00 until 22:00.
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Gusty winds will accompany the poor weather conditions which will make it feel bitterly cold, so make sure you wrap up warm.
"I have just come off the phone with Police Scotland, who've advised that they will be upgrading their travel warning from a stage three to a stage four", he told fellow MSPs.
Police have taken the almost unprecedented step of telling nearly a million drivers to stay off the roads, as Scots were warned to prepare themselves for another two days of severe disruption caused by snow and ice.
Some schools in the Borders, South Lanarkshire, Perth and Kinross and the Highlands are closed due to the weather, while North Lanarkshire Council said schools would shut early.
The snow and ice warning covering the north and west of the county is in place until 11.55pm today.
The warning states: "Ice is expected to form on untreated roads, pavements and cycle paths across parts of southeast Scotland and northeast England from late Thursday afternoon".
Blizzards and thundersnow plagued the northern edges of the country on Friday when snow continued to fall, especially at high levels and on the mountains of western Scotland. Widespread damage, travel and power disruption and risk to life is likely.