UK snow: Freezing conditions hit evening rush hour Freezing weather conditions have continued to affect parts of the UK, causing widespread disruption to the evening rush hour. A quarter of flights at Heathrow have been cancelled, while rail travel and ferry services have also been affected. Drivers have been warned of "treacherous" conditions after snow turned to ice on the roads. The weather forced more than a thousand schools to close on Monday. Several thousand homes remain without power. Forecasters are warning that temperatures could hit -13C (9F) overnight. That would make it the coldest night of the winter so far. Yellow Met Office warnings for snow and ice are in place for Wales, Northern Ireland, parts of Scotland, the Midlands and south east of England, continuing into Tuesday. There is a risk of up to 5cm of additional snow on higher ground in Kent, Sussex, Surrey and Hampshire, but it is not expected to settle at lower levels. BBC weather forecaster Steve Cleaton said hazardous conditions would continue in the coming days, although snowfall would be less than that seen at the weekend. "A perishingly cold night is expected as we move through Monday evening into Tuesday, with another widespread and severe frost, and temperatures plummeting to below -10C across any snowfields," he said. Why does snow close so many schools? Snow in Europe triggers transport chaos Uber taxi snow quote 'outrageous' Snowy branch drops on Michael Owen's car Snow-covered windscreen gets Harlow driver in trouble More than 600 schools closed in Wales on Monday, and in Birmingham, the city council shut all of its local authority-run schools. Hundreds more are closed in Buckinghamshire, Shropshire, Gloucestershire, Denbighshire, Worcestershire, Warwickshire, Oxfordshire and Northamptonshire. Wintry conditions are causing significant travel disruption: Chiltern Railways, Arriva Trains Wales, Cross Country, East Midlands Trains, Great Western Railway, Thameslink, Virgin Trains and the West Midlands rail network are all affected - National Rail says travellers should check with train operators before heading out Dozens of flights have been cancelled from Heathrow after crews and aircraft were left out of position by Sunday's problems. Passengers are advised to check before setting off for the airport Travel expert Simon Calder estimates that 50,000 British Airways (BA) passengers were stranded at airports in the UK and around the world on Sunday. The airline said additional staff were rebooking customers on to the next available flights and offering hotel accommodation The issues at Heathrow have led to dozens of knock-on flight cancellations in Scotland , Cardiff and Belfast The Port of Calais has reopened after closing for a few hours on Monday afternoon. P&O Ferries is reporting delays of up to two hours on journeys between Dover and Calais. Ferry company DFDS also has delays on its services between England and France Eurotunnel says services are now back to normal after some passengers suffered long delays overnight - the firm says conditions remain "very challenging" Motoring bodies the AA and RAC are warning drivers to adjust to the conditions "by slowing down and keeping a good distance" Meanwhile, a trackside fire at London Waterloo has added to the delays, causing major disruption to journeys to and from the station. Have you experienced any disruption? Please share your experiences with us by emailing haveyoursay@bbc.co.uk . More than 140,000 homes lost power on Sunday and several thousand homes are still cut off. Western Power Distribution said 99,500 customers were cut off on Sunday across the East Midlands, South Wales and the South West. By Monday afternoon, about 9,000 homes were still without power, including more than 6,700 in the West Midlands. Scottish and Southern Electricity Networks also said they had brought power back to 55,000 homes, but 750 remained cut off in Oxfordshire. Get news from the BBC in your inbox, each weekday morning Have you experienced any disruption? Please share your experiences with us by emailing haveyoursay@bbc.co.uk . Please include a contact number if you are willing to speak to a BBC journalist. You can also contact us in the following ways: WhatsApp: +447555 173285 Tweet: @BBC_HaveYourSay Upload your pictures / video here Send an SMS or MMS to 61124 or +44 7624 800 100 Or comment here: Name Your E-mail address (required) Town & Country Your telephone number Comments (required) If you are happy to be contacted by a BBC journalist please leave a telephone number that we can contact you on. 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