Whilst not all areas will be affected, heavy showers and thunderstorms may develop in places during the early hours of Thursday and into Thursday morning, perhaps merging into some larger areas of rain. Where heavy downpours occur, 20-40 mm of rain could accumulate in less than an hour, bringing the risk of some surface water flooding. Hail and lightning will be additional hazards. Further scattered heavy showers and thunderstorms are then likely to develop on Thursday afternoon and evening across portions of central and eastern Scotland in particular. These will be rather slow-moving, potentially giving isolated accumulations of 40-60 mm in an hour, with a higher likelihood of some impacts from surface water flooding. Showers and thunderstorms should slowly decay during the mid to late evening. For further details see https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings

Whilst most areas will remain dry, a few isolated to well-scattered heavy showers and thunderstorms could develop on Wednesday afternoon and evening. Where these occur, some places could receive 20-30 mm in less than an hour, with very localised totals in excess of 50 mm possible if storms repeatedly affect the same areas. The most intense thunderstorms could produce large hail and gusty winds. Showers and thunderstorms will tend to ease mid to late evening, but may linger over Orkney and the far north of mainland Scotland into the first part of the night. For further details see https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings