Heavy, thundery showers on Saturday afternoon and evening have the potential to bring localised flooding, hail and frequent lightning.
Skies will brighten following a band of showery rain, though rising temperatures will cause heavy showers to develop. Whilst many will miss the worst, some places could see 20-30 mm in an hour or less. The risk of this looks slightly higher across Scotland than across England or Northern Ireland.
Rain will become persistent and heavy at times on Saturday afternoon and evening. Some torrential thundery outbreaks are likely in places, leading to some localised flooding, especially on the roads where some travel disruption may occur.
A band of heavy rain will spread north across Scotland on Saturday. The rain will be most persistent in the northwest, where 30-40mm is likely quite widely. Where the heaviest downpours occur, there could be more than 60mm locally.
Another band of heavy rain is likely to spread northward through Sunday into Monday, with some locally torrential downpours and thunder possible. There are early indications that this could result in some disruption, with sudden flooding of roads, transport routes, homes and businesses possible. Please monitor forecasts through this weekend.
Torrential rain and thunderstorms could give as much as 30mm, possibly 40mm in an hour in places. It is not certain where flooding impacts may occur, but it is likely to be in a few places rather than across the whole warning area. Lightning strikes are also possible, which bring a chance of power cuts.