Heavy, squally showers will turn to sleet, hail and snow for many areas of Scotland later on Monday, then parts of Northern Ireland and the far north of England Monday night. Snow showers will continue through Tuesday and Tuesday night, although perhaps more of sleet and hail near some coasts. Over the hills, snow will drift in the strong to gale force winds. The warning has been updated to increase the amounts of snow and impacts. Travel delays on roads are possible, as are public transport cancellations. There is a chance of power cuts, while services such as mobile phone coverage may be affected. A few rural communities may become cut off. In addition some roads and pavements will turn icy, increasing the chances of accidents or injuries.
Snow showers will be heaviest and most frequent across western Scotland, where high ground is likely to see 10-20 cm building up above 200-300 metres. There may also be more than 15 cm over the hills of Northern Ireland, especially in the north. At low levels throughout the warning area, 2-8 cm will be more typical, with some places seeing very little. Showers will be accompanied by hail and lightning at times, particularly across western Scotland. Here, in particular, there is potential for disruption to power supplies from lightning strikes. Strong winds bring the potential for temporary blizzard conditions and drifting of lying snow, mainly over high ground.
Showers will turn to sleet, snow and hail late on Monday night across northern England, and then affect parts of Wales and the Midlands Tuesday evening and overnight into Wednesday. Delays to travel are possible, with a lower likelihood of cancellations of public transport. Some roads and pavements will turn icy, with an increased likelihood of some accidents and injuries.
2-6 cm of snow may fall in places, especially on higher ground above 100-200m. A slushy cover of 1 or 2 cm seems more likely at lower levels and closer to the western coasts, some areas seeing very little or no snow. Some drifting may occur on cross-Pennine routes in the strong to gale winds.
Snow showers are expected during Wednesday evening before a spell of more persistent and possibly heavy snow develops in places during Wednesday night. Any persistent snow is most likely to clear east before dawn on Thursday but further snow showers are likely to follow. Travel delays are possible on roads with a risk that some vehicles and passengers could become stranded. Delays or cancellations are possible to rail and air travel. Some rural communities could become cut off. Power cuts may occur and other services, such as mobile phone, may be affected.
A deepening area of low pressure is expected to track east across the UK during Wednesday night and into Thursday. Across parts of the north, a spell of persistent and perhaps heavy snow may develop. This could see 3-8 cm of snow accumulate in places with up to 20 cm over high ground. There is still significant uncertainty regarding the extent and location of any heavy snowfall, at this stage parts of northern and central Scotland appear most at risk.
Very strong winds will affect parts of the UK during Wednesday night and into Thursday. The strongest winds are expected to transfer eastwards across the warning area before clearing by early afternoon. Road, rail and ferry services may be affected, with longer journey times and cancellations. There is also a possibility that some bridges may close. Power cuts may occur, with the potential to affect other services, such as mobile phone coverage. Injuries and danger to life from flying debris are possible, along with some damage to buildings. In addition, large waves are expected to affect some western coasts with beach material being thrown onto sea fronts, coastal roads and properties.
During Wednesday night and into Thursday there is the potential for gusts of 60-70 mph quite widely and a small chance of winds reaching 80 mph in places. The location of the most damaging winds is currently uncertain, although parts of northern and eastern England along with southern Scotland currently look more at risk. Along with the strong winds a spell of heavy rain can also be expected, which could also be combined with a temporary thaw of lying snow in the north.