The Met Office has provided a comprehensive explanation for the persistent and often exceptional rainfall experienced across the UK and parts of Europe, attributing it to a particularly strong and south-westerly jet stream. This powerful ribbon of fast-moving air high in the atmosphere has been effectively channelling a succession of low-pressure systems directly over the region, leading to a prolonged period of unsettled and wet weather.
The jet stream acts as a conveyor belt for weather systems, and when it adopts a southerly track, it can draw in warmer, more moisture-laden air from the Atlantic. This effect is amplified when the jet stream is particularly strong, creating what meteorologists sometimes refer to as an 'atmospheric river' – a narrow corridor of concentrated moisture transport. These atmospheric rivers are capable of delivering vast quantities of rainfall over short periods, as seen in recent weeks across various parts of the UK.
For England, areas such as the South West and Cumbria have already experienced significant rainfall totals, leading to localised flooding and disruption. Wales has also seen extensive periods of heavy rain, particularly in western and upland areas. Scotland, while experiencing its share of wet weather, has seen variations, with some eastern parts being slightly drier but still subject to strong winds and showers. Northern Ireland has similarly endured a run of unsettled conditions, with persistent rainfall impacting agricultural activities and travel.
The current pattern is consistent with a shift in the jet stream's typical behaviour, which has remained in a position conducive to bringing wet weather to our shores. This is not an isolated incident; similar configurations of the jet stream have been linked to other periods of prolonged rainfall in the past. However, its current strength and persistence are notable, contributing to the exceptional nature of the recent deluge.
Looking ahead, Met Office forecasts suggest that while there may be some temporary lulls, the overall pattern for the coming days remains largely unsettled. Further low-pressure systems are expected to move in from the Atlantic, bringing additional rainfall and strong winds. Temperatures are likely to remain mild for the time of year, typically ranging from 8-12°C in the south and 5-10°C further north, but the focus remains on the continued risk of heavy rain and potential for disruption. Wind speeds could reach 40-50 mph in exposed coastal areas, with gusts of 60 mph possible during the passage of particularly deep low-pressure systems.
Practical safety advice from the Met Office includes staying informed about local weather warnings, being prepared for potential flooding by securing outdoor items, and avoiding driving through floodwater. Commuters should check travel information before setting off, as road and rail networks may be affected by surface water and strong winds.
Source: Met Office