Regions and local authorities affected:
East of England, London & South East England, Central, Tayside & Fife Grampian Highlands & Eilean Siar North East England North West England Northern Ireland SW Scotland, Lothian Borders Strathclyde Wales Yorkshire & Humber
The UK is facing one of the most severe winter freezes for almost a decade with more snow forecast widely and temperatures set to plummet to -15C within days.
Daytime temperatures could dip to -10C (14F) in Scotland with lows of -7C (19.4F) forecast across central England and -3C (26.6F) in the far south.
Bitter winds and lying snow will make it feel close to -15C (5F) overnight in the north as the south touches -9C (15.8F).
Scotland and northern England are in the firing line for the heaviest snowfall although experts warn a nationwide whiteout is possible.
Britain could be facing the most severe winter freeze since 2010/11 which brought record low temperatures and widespread chaos.
Snowfall will turn heavier and more widespread after the weekend with much of the country at risk by next Wednesday.
Extreme winter conditions will hold out through the week with some long-range forecasters warning of a month-long Arctic lockdown.
Piers Corbyn, forecaster for WeatherAction, said: “We are keeping a very close eye on developments next week with a major bout of severe wintry weather in the forecasts.
“We expect the northern half of the country to be hit by severe and disruptive snowfall with very strong winds from the north bringing blizzard conditions.
“We currently think half of the country will be affected, but we could see snow widely and if this system does sink further south it will be very severe across the whole of Britain.”
Between 20:00 Sun 4th and 10:00 Mon 5th
Wintry showers are expected to affect southeast England through Sunday night and Monday morning. Some roads and railways are likely to be affected with longer journey times by road, bus and train services. Some icy patches are likely to develop on untreated roads, pavements and cycle paths.
Between 21:00 Mon 5th and 15:00 Tue 6th
A spell of rain, sleet and increasingly snow will move east across the UK on Monday night and Tuesday, gradually weakening across England and Wales. Some roads and railways may be affected with longer journey times by road, bus and train services. As rain, sleet and snow clears Northern Ireland and Scotland overnight, ice may form on some untreated roads, pavements and cycle paths.