A yellow weather warning issued for many parts of the north-east today has also been extended to the a large area of the Highlands.
The Met Office said heavy rain and thunderstorms will hit Aberdeen, Aberdeenshire, Moray and the Highlands for the duration of the day.
The weather warning is in place until 11:59pm today, Monday, September 2.
Aberdeen and and several towns in Aberdeenshire are affected including Stonehaven, Fraserburgh, Peterhead, Ballater and Inverurie.
The whole Moray region is also impacted, with heavy rain hitting Elgin for most of the day.
Meanwhile, several parts of the Highlands have now been placed under the thunderstone warning, including Inverness, Nairn, Aviemore, Alness, Wick, Thurso and Orkney.
Weather may lead to disruption in north and north-east
The Met Office has warned that in places where flooding or lightning strikes occur, there will be a chance of travel delays and cancellations.
Driving conditions may also be affected by spray and sudden flooding, while there is a small chance communities could be cut off by flooded roads.
The warning added: “The extent of these thunderstorms remains very uncertain and whilst many places will miss them, some places may see 30 to 40 mm of rain fall in less than an hour and perhaps over 60-80 mm in one or two places.
“Frequent lightning strikes and hail will be additional hazards.”
There is a slight chance that power cuts could occur and other services to homes and businesses could be lost.
Forecasters say that homes and businesses could be flooded quickly, with damage to some buildings from floodwater, lightning strikes, hail or strong winds.
Roads such as the A96, the A90 and the A9 are within the yellow warning area, so motorists are urged to drive cautiously.
Flood alerts in north and north-east
Four flood alerts have also been issued by SEPA for the north and north-east of Scotland.
They are in place in Aberdeenshire and Aberdeen City, Findhorn, Nairn, Moray and Speyside, Caithness and Sutherland as well as Orkney.
The alert said: “Heavy showers with the risk of thunder from mid Sunday afternoon and throughout Monday could cause flooding impacts from surface water and rivers.
“Particularly at risk are urban areas and the transport network.
“Impacts may include flooding to low-lying land and roads, difficult driving conditions and disruption to travel. Isolated properties may also be at risk.”
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