Outbreaks of rain spreading eastwards across Northern Ireland in the early hours of Sunday are likely to fall onto freezing surfaces following the recent very cold spell. Icy patches on some untreated roads, pavements and cycle paths are probable. This could lead to some injuries from slips and falls on icy surfaces.
An active frontal system will bring rain into Northern Ireland in the early hours of Sunday. Following the recent very cold spell, many surfaces will be below freezing leading to icy patches. In addition some sleet or wet snow is likely for a time, mainly over high ground. Temperatures will recover slowly during Sunday morning.
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 to cover much of the Midlands and parts of eastern England and some northern parts of Wales.
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. There is significant uncertainty regarding the southern limit of any snow accumulations.