A wintry blast labelled the ‘Beast from the East’ has caused an entire waterfall to freeze in the Brecon Beacons.
Plummeting temperatures have brought snow which has caused disruption across Britain.
There is more to come, with forecasters warning the country could be facing the coldest weather since 1991.
In excess of 20cm of snow expected to fall by Wednesday and Storm Emma could bring blizzards, gales and sleet.
The storm is set to move north through Europe and is due to hit the UK on Thursday and Friday.
Met Office forecaster Frank Saunders predicts: ‘Parts of England and Wales are likely to see their coldest spell of weather since at least 2013, and possibly since 1991.
‘This could lead to dangerous conditions on roads and pavements and have an impact on people’s health.’
Storm Emma is likely to be ‘significantly disruptive’ and there are fears she will increase the risk of power cuts and transport delays.
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Lows of minus 6C were recorded in Aviemore, Scotland, overnight provoking doctors to warn that the NHS could struggle to cope with extra demand due to freezing temperatures and dangerous driving conditions.
The public have also been asked to look out for the homeless and report anyone sleeping rough in the freezing conditions to their local council.
It would also be wise to check on elderly or vulnerable neighbours during the cold spell.
Amber warnings of snow have been issued by the Met Office for north-east, central and south-eastern England on Tuesday, and eastern Scotland for Wednesday.
The Met Office also advised that some rural communities could potentially become cut off, with power outages and disruption to mobile phone services likely.
Delays to train travel, road traffic and flight disruption could be likely by the middle of the week.
A less severe yellow warning for snow is in place from up to Thursday.
Temperatures of minus 5C (23F) over the weekend were the lowest recorded in the week leading up to March 1 – the first day of spring – since back in 1986.
The freezing wind chill, which could see parts of the UK feeling as cold as minus 15C (5F), rivals the temperatures forecast for parts of northern Norway and Iceland.