The 'Beast from the East' has brought heavy snow to Cumbria and the south of Scotland.
It's causing widespread travel disruption on the roads and railways.
Police across the region are advising motorists to only travel if absolutely necessary.
No trains are running between Preston and Scotland on the West Coast Mainline, or between Carlisle and Glasgow/Edinburgh.
A spokesman for Network Rail said:
Stagecoach have reported that all services in the lakes will be operating as normal. However, the Kendal town services are experiencing some delays.
The treacherous weather conditions have closed more than 200 schools in Cumbria, all schools in the Scottish Borders, and more than 80 in Dumfries and Galloway.
All schools in the Scottish Borders will be closed again tomorrow.
The snow has also forced Cumbria's university campuses to shut.
13cm of snow has fallen in Spadeadam, east of Brampton, with a wind-chill factor of -24C reported on Great Dun Fell, east of Penrith.
The Met Office have issued their highest ever warning for snow in northern parts of the Scottish Borders.
Eastern parts of Cumbria and much of the Scottish Borders remain under amber warning, with the rest of the region covered by a yellow warning for snow.