The remaining three are for snow and ice, covering the western side of Scotland and into north west England until 12pm; central regions, Wales and the north east between 12pm and 11am on Wednesday, and the south east, East Anglia and London from 9pm on Tuesday until 12pm on Wednesday.
Powys County Council has already prepared for the weather and will have gritters and snow ploughs out on main roads.
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According to the Met Office, between 3-5cm of snow is likely in areas above 200m, while up to 10cm is possible in a few places.
A Police Scotland tweet said: "Some hard driving conditions, particularly in the West of the country this morning, due to rain showers falling as snow in some places".
Snow has already begun to fall in the highest parts of Devon with wintry showers across the Princetown area since midnight.
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The AA's George Flinton said: "Check the washer fluid levels are topped up with a good-quality low temperature resistance additive to reduce the risk of freezing and make sure all your lights are working and clean, so you can see and be seen".
Following the first significant snow of the year in parts of the north west last week, Met Éireann has warned that frost and icy patches will develop overnight in clear spells into Tuesday morning, with rain and sleet developing in the west towards midnight on Monday and spreading eastwards overnight.
"By the time we get to Wednesday morning we could easily in places be seeing a cm or two, 1-3cm generally but some places won't see any and just get outbreaks of rain".
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"Showers will turn increasingly to snow on Tuesday morning".