http://www.bbc.co.uk/weather/2635167#outlook Monday 11 April—Sunday 17 April
A north/south divide initially, then cooler.
The week will begin on a fairly dry and bright note across Scotland and northern and eastern England. Further to the west and southwest, a weather front will bring rain across Northern Ireland, Wales and southwest England and also parts of The Midlands at times. This weather front will play an important role in the week's weather, marking the boundary between milder, showery weather to its south, and cooler and generally drier conditions to its north.
Through Monday and overnight into Tuesday, the weather front will slowly drift north so that by Tuesday morning, the front will lie across northern England, Northern Ireland and southern parts of Scotland. Across northern Scotland, expect some good spells of sunshine, but with a chilly feel and the risk of a few wintry showers from time to time. Near the weather front, skies will be cloudier with the possibility of some prolonged spells of rain, and a cool feel. South of the frontal zone, there will be the potential for some warm spells of sunshine, but these will be interrupted by some heavy and thundery showers at times.
During the course of Wednesday and Thursday the weather front will slowly drift south whilst simultaneously becoming weaker. This process will allow generally drier, brighter and cooler conditions to push down from the north across most areas, with only occasional showers. Across southern areas though, the weather front will likely become stalled with wetter and milder conditions persisting across the far south of England and possibly the fringes of southern Wales.
The weekend will likely begin on a chilly note with high pressure to the northwest of the UK resulting in a cool and largely dry northerly air stream across the UK. However, as the weekend progresses, low pressure should slowly encroach from the southwest, gradually reintroducing showery and milder conditions to all parts of the UK by early the following week.
Monday 18 April—Sunday 24 April
Low pressure becoming re-established.
Moving into the start of third full week of April, it looks likely that the meteorological set up in the vicinity of the UK will consist of a region of high pressure extending from the north across most parts of the UK, and a low pressure system anchored just to the southwest. This will mean that the week will start off on a cool note, with some particularly chilly nights that will likely bring frost to many rural parts. By day though, there should be plenty of dry weather across central and northern parts, with some good spells of sunshine across western areas of Scotland and Northern Ireland in particular. Further to the south though, areas of rain and heavy showers will never be too far away as the low pressure system lies just to the southwest. Although there is some uncertainty in the forecast for the remainder of the period, at time of writing the favoured scenario was for the low pressure system to gradually move northeastwards across the UK. The outcome of such a set up will be to re-introduce warmer to air to most parts of the UK, but with the milder air will come the risk of heavy and potentially thundery showers moving up from the south to affect many parts at times.
Monday 25 April—Sunday 8 May
Drier with some late April warmth, perhaps?
The forecast for late April and early May exhibits an unusually high degree of uncertainty, even for a longer range forecast. That said, initially we anticipate a continuation of the showery theme affecting most parts of the UK, with the potential for some warmer spells, particularly across the southeast of England. As the period progresses, there are indications from some of the computer models that pressure will begin to build again across the UK. Such a scenario would lead to drier than average conditions across many areas, and offers at least the prospect of some warmth as the sun becomes increasingly powerful moving into early May.
Next week
Looking further ahead into May, there is currently very little consensus between the different forecasting models for the type of weather we can expect in the UK. That said, there is a marginal preference for pressure to remain relatively high near the UK, so there is the chance that drier weather will prevail, and with the Sun becoming increasingly strong, there is at least the scope for some warmer weather. Read next week's issue to find out more!