A yellow weather warning has been issued for thunderstorms across parts of North Wales.
The Met Office alert covers Wednesday, May 27, with storms expected to develop in the afternoon in parts of Wales and western England, potentially bringing downpours, frequent lightning and large hail.
They have said there is a good chance driving conditions will be affected by spray, standing water and/or hail, leading to longer journey times by car and bus.
Delays to train services are possible.
They also say there will probably be some damage to a few buildings and structures from lightning strikes.
There also could be some short-term power loss and some flooding in homes and businesses.
The warning extends from 3pm to 11.59pm.
It advises people to check whether their area is at risk of flash flooding and to prepare a flood plan and emergency kit if necessary.
The Met Office said: "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."
If caught outdoors during a thunderstorm, the advice is to seek shelter in a safe, enclosed space, such as a car.
People are urged not to shelter under trees or near tall objects that could attract lightning strikes.
Following another hot day, thunderstorms could bring torrential rain, gusty winds and other dangerous conditions.
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The Met Office regularly updates its warnings and encourages people to stay informed using weather forecasts for their area.
The yellow warning covers most of Wales, including Conwy, Denbighshire, Gwynedd, Anglesey and Wrexham in the north.
The Met Office classified the warning as medium likelihood with low overall impact.
The public can stay up to date and provide feedback on weather warnings through the Met Office website.
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