These yellow warnings for snow and ice affect different areas of the United Kingdom and will remain in place until Thursday morning.
"Ice may be the more widespread hazard".
It's set to be wintry overnight.
She said: "It's a cold start for what is going to be a cold day".
"Throughout the night some of these showers will be falling as a mix of rain, sleet and snow and these could bring icy patches as we look towards Monday morning rush hour".
A snow and ice warning has been issued for most of Scotland as commuters face travel disruption.
Forecasts for severe cold have triggered a government "weather action" health alert - one step below "national emergency".
MET OFFICE TWITTER WARNING Snow and freezing temperatures are set to hit the UK tonight
The yellow warning is generally to mean you should keep an eye on the latest forecast, and be aware that the weather may change or worsen in the next few days.
Up to 12 inches (30cm) of snow could fall over higher ground, namely the Scottish Highlands, as the end of the weekend approaches, she said.
"These will gradually fade overnight Tuesday into Wednesday, with icy stretches developing as skies clear, particularly where early snow has melted and then refrozen overnight".
Accumulations of up to 3cm of snow are expected this evening and tonight, leading to hazardous conditions on roads and footpaths, Met Eireann warned.
Vulnerable people, such as children and OAPs, have been told to take care in the cold conditions until Friday.
A band of rain, sleet and hill snow will move over Northern Ireland in the morning with temperatures rising up to 5C.
Aberdeen, Glasgow and Edinburgh, all 1-4, seem certain to be doused in snow by the end of the week, the bookies said.
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