Amber weather warnings are in place for north and north-east Scotland as snowy conditions in the region are expected to continue into Wednesday.
Icy conditions are also expected to persist around Scotland on Wednesday, with yellow weather warnings in place for the rest of the country.
Hundreds of schools in northern Scotland were closed for a second day as the wintry weather continued to cause travel disruption.
The Met Office issued an amber warning for snow for large parts of north-east and northern Scotland from 11am until 7pm on Tuesday, with forecasters warning of 5-10cm of snow widely, and up to 15cm in places.
A yellow warning of snow and ice is in place as far south as Perth until midnight on Tuesday.
The Met Office had also issued a yellow warning of snow and ice from the central belt south down beyond the border, active until 11am on Tuesday.
A further yellow warning for ice will be in place for the central belt and southern Scotland on Wednesday morning.
In Glasgow, services on the city’s subway network were suspended on Tuesday after ice on the third rail caused a power failure.
Operator SPT said: “Currently both inner and outer circles are suspended and no stations are open.”
Schools in the Highlands are due to reopen on Wednesday, though more snow is expected on Tuesday afternoon.
The snowy conditions disrupted road, air and rail travel across the country – with some train lines shut after heavy snow drifted on to the tracks.
National Rail said that train services in northern Scotland will be disrupted until the end of the day on Tuesday, although ScotRail said services on the route between Aberdeen and Dundee would run in the morning.
In the yellow alert area, forecasters predict that 2-5cm of snow is likely to fall fairly widely, with the possibility of a further 10-15cm in some areas.
From the central belt south forecasters predict an area of “mainly light snow” with most places likely to have no more than 1-2cm.
Describing conditions in the amber area, the Met Office said: “A spell of heavy snow is expected to move east across central and northern Scotland during Tuesday, clearing to wintry showers during Tuesday night.
“A further 5-10 cm is expected widely with 15cm in places, particularly above 200 metres.”
Police Scotland said the impact of the snow is likely to be felt over the next few days in the north and north-east of Scotland, urging people to follow travel advice.
Assistant chief constable Alan Waddell said: “Local resilience partnerships are continuing to meet to co-ordinate and deliver the response to disruption experienced by communities in the north and north-east of Scotland following heavy snowfall over the weekend.
Apologies all, due to a power failure at the depot we are unable to move trains into the system. Currently both Inner&Outer Circles are suspended and no stations are open. We are working to restore power and get trains moving. Update to follow. Apologies for the inconvenience. pic.twitter.com/67ueDj9apD
“We have been working closely with resilience partners across local authorities, other emergency service partners, transport partners, NHS and health and social care partnerships, and other local organisations to support communities affected by adverse weather and keep public services open where possible.
“Some services may be impacted by adverse weather and I would encourage the public to check on neighbours or relatives, if they are able to do so safely.”
Ministers met police, local authorities, utilities companies and other bodies on Monday to discuss recovery efforts and to prepare for further snow and ice warnings.
Posting on social media, Mr Swinney said: “Please be aware of amber warning of snow affecting much of the north of Scotland today and the yellow warning of snow and ice across most of Scotland.
“I am very grateful to all public bodies and volunteers for the support that is being provided. Please stay safe.”
The First Minister had earlier paid tribute to the “truly exceptional” efforts of farmers, volunteers and members of the public in helping clear roads, dig out cars and keep people safe, which he said showed “heartening” community spirit.
He added that ministers will continue to keep the situation “under review”.
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