Snow causes problems and heavy rain forecast in Wales 19 December 2013 Last updated at 17:17 On Wednesday 900 homes were left without power Heavy snow is causing problems on the roads in Powys, according to emergency services. Police said the A4518 Machynlleth to Dylife road is closed due to "treacherous conditions" after a car left the road and went into a ditch. Meanwhile a further weather warning has been issued for Wales as a second band of heavy rain is forecast. Persistent rain is expected from Friday afternoon and Natural Resources Wales urged vigilance for the next week. Storms battered Wales on Wednesday night and seven flood alerts are in place with more expected, particularly in the south. On Thursday afternoon, Dyfed Powys Police said the A4518 was closed after a car ended up in a ditch due to "treacherous" snowy conditions. The incident was reported at 15:15 GMT on Thursday and a farmer moved the car from the ditch. Nobody was injured but the road was closed to prevent more incidents, the force said. The incident was also attended by Mid and West Wales Fire and Rescue Service, who said another car had spun off the road in snow near the Crai reservoir on the A4067. There were no reported injuries. On Thursday, torrential rain left 900 homes in Neath Port Talbot temporarily without power and fallen cables closed a road on Anglesey. In the Gwent Police area, up to 4ft (1.2m) of water was reported on some roads while police across south and mid Wales received hundreds of calls about flooding and fallen trees. On Thursday, NRW said the rain would be falling on an already saturated ground and roads would be covered with surface water. The heaviest rain is forecast to fall in the south Wales valleys and the Brecon Beacons. "A number of warnings have been removed this morning, but with ground saturated, further rainfall will quickly find its way into rivers, meaning that further flood alerts and warnings are likely to be issued," a spokesman said. Meanwhile, Stena Line's Friday sailing from Holyhead to Dun Laoghaire originally scheduled to depart at 10:30 GMT will now leave at 08:30. More unsettled weather is expected on Monday and Christmas Day.