The Met Office has upgraded its thunderstorm weather warning to amber - with a stronger possibility of fast flowing or deep floodwater causing a danger to life.
In place until 9am on Wednesday, the heightened warning covers the east of Scotland, between Aberdeen, Inverness and Edinburgh.
An amber warning means people should be on alert for flash flooding and building damage from lightning strikes, floodwaters and hailstones.
Delays to public transport, difficult driving conditions and possible road closures could also follow, while deep and fast floodwater could be a threat to human life.
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