Temperatures in Braemar, Aberdeenshire, plunged to minus 14.5C (5.9F) on Thursday evening, which is the lowest temperature recorded anywhere in the United Kingdom since 2012, according to the Met Office.
Dan Holley, of Norwich-based Weatherquest, said the approaching weather system was looking "quite weak" with any snow accumulations "generally small and insignificant".
Several departures from London City Airport were delayed this morning due to poor visibility a day after airports in Manchester and Liverpool were forced to delay flights due to heavy snow.
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The amber warning will come into effect alongside four yellow warnings for snow and ice throughout Britain.
Snow depths of 8cm in Cumbria and 7cm in Inverness-shire were also recorded by the Met Office on Thursday evening, although this is believed to be mostly leftover from Wednesday.
Friday will be cold and cloudy with a further possibility of sleet and rain, according to the Met Office.
South East 4x4 Response, a team of highly skilled volunteers, is preparing to rescue motorists who could become trapped in the snow.
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Southeastern Trains said 21 services were being cancelled or altered on Thursday morning to minimise the impact of ice forming on the rails.
The north east of England and north Scotland will also see snow showers and cold temperatures on Thursday night.
Heavy snowfall has hit much of southern England and Wales, leaving hundreds of people trapped in cars as temperatures plummeted.
A local Sinn Fein councillor has written to the Director of Met Éireann asking for a meeting to discuss how the six counties in the North can be included in future weather warnings..
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