Temperatures in parts of Scotland could drop as low as -20°C overnight as the cold snap persists.
Forecasters have also warned that Thursday could bring the coldest January day in over a decade.
A 36-hour Met Office yellow warning for snow and ice remains in effect for the north and northeast of the country until midnight on Thursday.
On Wednesday, more than 50 schools across the Highlands were impacted, with most closed for the day due to snow and icy road conditions.
