Some snow will fall on Sunday morning across parts of southeast Wales, southwest and central southern England. Some roads and railways are likely to be affected with longer journey times by road, bus and train services.
Some snow will fall across parts of southeast Wales, southwest and central southern England on Sunday morning. Whilst many areas will see rain or sleet with no snow falling or lying some parts will see small accumulations. Up to 2 cm is possible on low ground with 5 cm possible above approximately 150 m such as the Cotswolds and North Wessex Downs.
Spells of heavy rain are likely on Sunday, which combined with thawing of lying snow, may lead to localised surface water flooding, especially in northern and western counties. Spray and localised flooding on roads probably making journey times longer Bus and train services may be affected with journey times taking longer.
An active weather system will introduce milder air from the west across Northern Ireland. 10-20 mm of rain is likely quite widely with locally 25 mm possible. This is likely to assist thawing of lying snow, increasing the risk of impacts from localised surface water flooding. This is most likely in northern and western counties where there is most snow lying.
An area of snow is likely to move eastwards across many central and northern parts of the UK on Sunday. The snow is more likely to affect higher routes with lower levels only affected more locally. In addition, rain may fall onto frozen surfaces for a time, particularly across Scotland, following a very cold night. Some roads and railways likely to be affected, with longer journey times by road, bus and train services. Some injuries from slips and falls on icy surfaces. Probably some icy patches on some untreated roads, pavements and cycle paths. The snow is expected to become confined to northeast Scotland later in the day as it progressively turns to rain from the southwest. This warning area has been extended northwards to cover the northwest Highlands, parts of the Western Isles and southwards to cover more of Hertfordshire, Essex and Suffolk.
Amounts of fresh snow will vary considerably across the warning area. Most of the snow is expected on higher ground with 3-6 cm likely above around 200 m and perhaps 10-15 cm locally on ground above 300 m over Scotland. At lower levels 1-3 cm is possible locally, but with many spots escaping altogether.