Some showers might develop into scattered thunderstorms in places across northwestern parts of the UK during the afternoon. CAPE of 400-600 J/kg allows some convective showers to develop across parts of Scotland at night, therefore a slight risk has been issued. Thundery showers might continue across Orkney at Friday morning but it is out of the outlook time span so it is not in the slight risk
Later in the evening, Storm Ciarán will introduce a series of weather fronts and bring very gusty wind and heavy rain to southern England and Wales. These fronts will also introduce a warm theta-e air mass to southern parts of England. Isolated thunderstorms are possible between fronts, perhaps bringing some hail and isolated tornadoes especially toward the south coasts.
You can download the kml file of the warning here
(You can upload the file to windy.com to have the graphic overlay)
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