Forecasters warn that some Scots buildings could be struck by lightning as another yellow weather warning is issued.
The Met Office warning for thunderstorms is in place for the north east of Scotland from 1pm until 9pm today.
Around 20mm of rain is expected to land in just an hour, with up to double that anticipated over the nine-hour spell overall.
Lightning and even hail is predicted to hit areas such as Aberdeenshire, Angus and Perth and Kinross.
Some homes and businesses could be hit by flooding, with disruption on the roads and public transport services expected.
A forecast from the Met Office reads: “Heavy showers and thunderstorms will break out during the afternoon. 10 to 20mm rain could fall in an hour or so in some places and 20 to 40mm of rain may build up over several hours in a few spots.
“Lightning and hail will be additional hazards for some.
“These showers will then ease and fade away during the evening.”
Flash flooding has impacted huge parts of Scotland over recent days amid a prolonged spell of thunderstorms across the country.
Most of the disruption appeared to be isolated in southern and central parts of Scotland.
A TK Maxx branch in Glasgow had to be evacuated after the rain water burst through the ceiling yesterday, while a number of homes nearby were submerged in floods.
Seven areas in Scotland have been placed on flood alert as large parts of the country continue to deal with the aftermath of the conditions.
In an updated flood alert for Aberdeenshire, the Scottish Environment Protection Agency (SEPA) said: “On Tuesday locally heavy slow moving showers could cause flooding impacts from surface water and smaller rivers and watercourses. Due to the localised nature of the heaviest showers, not all locations will be affected.
“The onset of flooding could be very fast where the heaviest downpours occur. Particularly at risk are urban areas and the transport network, flooding to properties, low-lying land and roads and disruption to travel are likely.
“Extra care should be taken if spending time in the outdoors on or near watercourses as water levels could rise rapidly.
“Remain vigilant and remember, it is your responsibility to take actions which help protect yourself and your property.”
