Monday 21.7.25

Tomorrow's UK Weather Warnings: Monday, July 21, 2025

As Sunday draws to a close, a significant portion of the UK is bracing for continued unsettled weather on Monday, July 21, 2025. The Met Office has issued widespread Yellow warnings for thunderstorms and rain, indicating the potential for further disruption across various regions.¹

Thunderstorm Warnings Dominate

Yellow warnings for thunderstorms are the most prominent feature of tomorrow's forecast, covering vast areas of England and Scotland, and extending into parts of Wales.² These warnings generally come into effect from 11:00 BST and remain active until 21:00 BST.

In England, the thunderstorm warning covers the East of England, London & South East England, South West England, the Midlands (East and West), and northern England (North East and North West), and Yorkshire & Humber. This means cities such as London, Birmingham, Manchester, and Leeds could experience heavy showers and thunderstorms.³ The Met Office anticipates that while many areas may escape the worst, some places could see significant rainfall, with 30-50 mm potentially falling within just a couple of hours.⁴ This intensity of rain raises concerns for localised surface water flooding, which could lead to difficult driving conditions, spray on roads, and potential road closures.⁵ There's also a risk of some homes and businesses being flooded, and a slight chance of power cuts and disruptions to train and bus services.⁶ Lightning, hail, and gusty winds are additional hazards associated with these thunderstorms.

Similarly, much of Scotland, including Central, Tayside & Fife, Grampian, Highlands & Eilean Siar, and SW Scotland, Lothian Borders, Strathclyde, is also under a Yellow thunderstorm warning for the same period. Residents in these Scottish regions should be prepared for similar impacts, including localised flooding and travel disruption.

Ongoing Rain Warning for Northern Ireland

While the focus shifts to thunderstorms for much of Great Britain, Northern Ireland continues to experience a Yellow warning for rain, which began on Sunday evening and remains active until 18:00 BST on Monday.⁷Eastern parts of Northern Ireland are particularly susceptible to heavy rainfall, with reports suggesting that some areas could receive more than half a month's worth of rain in less than a day.⁸ This ongoing heavy rain poses a risk of flooding, dangerous driving conditions, and potential power cuts.⁹ Communities could also become cut off by impassable roads.

Impacts and Advice

The overall picture for Monday is one of continued atmospheric instability. The combination of low pressure and humid air across the country will fuel these heavy, thundery showers. It's crucial to remember that even within the warning areas, some places may remain dry, while others experience intense downpours.

The Met Office advises the public to remain vigilant and stay updated with the latest forecasts for their specific locations.¹⁰ Travellers are encouraged to check road conditions and public transport timetables before setting out, as delays and cancellations are likely. Preparing for potential power cuts and considering a flood plan if your property is at risk are also recommended precautions. The changeable nature of the weather means that conditions can develop rapidly, so awareness is key to minimising disruption and ensuring safety.

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