A yellow weather warning has been issued by the Met Office for parts of South Wales, following forecasts of heavy showers expected to cause localised flooding, transport disruption and possible power outages. The alert, which took immediate effect on Thursday, August 28, 2025, is due to remain in force until 4:00 pm.
The areas affected include several local authorities in the south of the country, where rainfall is expected to be most intense. According to SouthWalesArgus, only a limited number of regions are under this warning, and the Met Office has indicated that conditions may evolve throughout the day depending on wind direction and pressure shifts.
Specific Regions Under Alert
According to the Met Office, only a limited area of South Wales falls under the warning. The affected local authorities include Bridgend, Merthyr Tydfil, Neath Port Talbot, Powys, Rhondda Cynon Taf, and Swansea. These areas are likely to experience a high volume of rain over several hours, with conditions gradually easing later in the day.
Origin and Expected Impact of the Weather System
A Met Office spokesperson explained the source and projected evolution of the weather:
Persistent heavy showers are likely to continue to feed in across the region, from the Bristol Channel, for the next several hours. They will tend to become less frequent later this afternoon as the wind direction changes from southwesterly to westerly.
The weather warning was triggered due to forecasts indicating a combination of risks. These include flooding of homes and commercial properties, surface water accumulation on roads that may make driving conditions hazardous, longer journey times caused by spray and localised flooding, and potential power outages that could disrupt essential services.
Preparing for Adverse Conditions
The Met Office issued detailed guidance for residents and travelers in the affected zones. In a statement, a spokesperson said:
Check if your property could be at risk of flooding. If so, consider preparing a flood plan and an emergency flood kit. Give yourself the best chance of avoiding delays by checking road conditions if driving, or bus and train timetables, amending your travel plans if necessary. People cope better with power cuts when they have prepared for them in advance.
It’s easy to do; consider gathering torches and batteries, a mobile phone power pack and other essential items. Be prepared for weather warnings to change quickly: when a weather warning is issued, the Met Office recommends staying up to date with the weather forecast in your area.
The agency also advises residents to register for flood alerts where available and to assess whether any low-lying infrastructure in their community may be vulnerable to surface runoff.
Conditions Expected to Ease by Late Afternoon
While the heaviest rainfall is forecast during the morning and early afternoon, meteorological models indicate that weather intensity should gradually subside by mid-afternoon. This is expected to follow a shift in atmospheric pressure and wind patterns.
This update is part of a wider communication strategy by the Met Office, which recently released its 2024/2025 storm naming list, including names from Ashley to Wren, aiming to enhance public awareness of severe weather systems in the UK.
A further review of conditions is expected later in the day. The Met Office encourages the public to follow its latest bulletins and make informed decisions when planning any travel or outdoor activities in South Wales.
