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A train exits a tunnel at Clayton near Brighton in southern England December 18, 2009. Commuters and air passengers faced delays and disruption across much of Britain on Friday after heavy snowfall with the forecaster saying more was on the wa - Source: Reuters
Snow, sleet and rain fell across swathes of Britain on Tuesday making driving hazardous, with a thick blanket of snow covering parts of Wales and the Midlands as temperatures fell.
The Met office says the severe weather is likely to persist into Wednesday with more snow and sleet expected in many areas.
Forecasters in Wales and central England said snow would be heavy at times with snow drifts likely amid strong easterly winds, leading to blizzard conditions in the Welsh hills.
It warned power supplies and transport could be heavily affected.
The Met Office said 25-30 cm could build up on Welsh hills later on Tuesday, with between 5 and 10 cm falling across much of south Wales, Herefordshire and Shropshire.
It would be the heaviest snow to hit the area this year as a band of rain moving up from the south hits a mass of cold air lingering over the region.
Extreme weather warnings were also issued for northwest England, Yorkshire and Humber, the Midlands, east and southwest England.
Last week's snowfalls mainly affected eastern and southern England, bringing travel chaos to airports and roads.
Snow in the Scottish Highlands affected regional airports, with early flights cancelled at Inverness airport and delays occurring at Stornaway and Kirkwall.
Rail services into Glasgow Central station were also hit, with several trains cancelled.
Looking further ahead, the weather is expected to remain cool, with snow potentially falling on New Year revellers in Scotland on Thursday night and sleety showers coming down elsewhere.
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