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Weather warning: Snow forecast in Wales on Friday Weather warning: Be prepared for snow - Met Office
(about 6 hours later)
The Met Office has upgraded snow warnings for parts of Wales into Friday morning. The first significant snowfall of the winter is set to arrive in Wales on Friday, though it is not expected to be as bad as that in December last year.
Forecasters say there is potential for travel disruption as over 10cm (4in) of snow could fall on higher ground. The Met Office says the south Wales valleys, the hills of mid Wales, the Black Mountains and the Brecon Beacons are likely to be worst hit.
Areas which could be affected include the south Wales valleys, the hills of mid Wales, the Black Mountains and the Brecon Beacons. It has upgraded snow warnings in to Friday morning, warning of over 10cm (4in) of snow on higher ground.
Meanwhile, a lightning strike is continuing to cause delays to south Wales rail services. Meanwhile, rail delays caused by a lightning strike have been cleared.
Signalling equipment was damaged in the Llantrisant area href="http://www.bbc.co.uk/news/uk-wales-16190191" >causing problems on the main line between Cardiff and Bridgend. The Met Office has warned that heavy rain overnight is likely to turn to snow early on Friday.
The Met Office warned that heavy rain was likely to turn to snow early on Friday. BBC Wales meteorologist Derek Brockway said: "It's still coming but don't panic - the snow won't be anywhere near as bad as last December.
Sleet is more likely on lower ground but snow has not been ruled out. "Some disruption is likely but not everywhere will have snow. In fact we're in for a real mix of rain, hail and snow.
BBC Wales meteorologist Derek Brockway said: "Based on the latest information from the Met Office, the higher ground of south and mid Wales could be worst hit by snow but, of course, things could change with further updates later on Thursday. 'Drivers'
"There is still some uncertainty on the path of a deepening area of low pressure moving in from the Atlantic. "Whether you get snow will depend on where you live and how high you are above sea level."
"A change in direction of just 50 to 100 miles north or south can make all the difference as to which part of Britain will get heavy rain, snow and severe gales." The Met Office has issued an amber warning which means be prepared, plus a map showing where most of the snow will fall.
Rain in Pembrokeshire will spread across the rest of Wales on Thursday evening and will turn increasingly to sleet and snow after midnight. A yellow [be aware] warning remains in place in some areas.
Wintry weather Mr Brockway added: "After midnight the rain will turn increasingly to sleet and snow with temperatures around freezing or just above with a north-easterly breeze.
On the coast it will probably stay as rain or sleet, but may turn to snow inland. "So first thing tomorrow a mixture of rain and snow. During the day the rain and snow will move away. It will brighten-up but with wintry showers."
The Met Office has now issued a stronger amber [be prepared] snow warning for parts of Wales, while a yellow [be aware] warning remains in place in some areas.
The warnings take into account how likely snow is and the potential impact the expected conditions may have.
Parts of mid Wales, the south Wales valleys and Monmouthshire could have 2-5cm of snow (1-2in).
More than 10cm (4in) is possible on higher ground such as the heads of the valleys, the Black Mountains, the Brecon Beacons and the hills of mid Wales.
While the wintry weather continues, police are advising drivers to ensure they have plenty of fuel in the tank, fully charge their mobile phones before setting off, and to carry warm waterproof clothing, food, water and a torch.While the wintry weather continues, police are advising drivers to ensure they have plenty of fuel in the tank, fully charge their mobile phones before setting off, and to carry warm waterproof clothing, food, water and a torch.
Rail passengers across much of south Wales faced continued delays and disruption from first thing on Thursday following a double lightning strike early on Wednesday that damaged signals on the Cardiff to Bridgend mainline.
The fault was fixed on Thursday afternoon and normal timetables were resumed in time of the evening rush hour.