PARTS of the country could get more than two months’ rainfall in just a few hours as thunderstorms move in across the country.

Forecasters are preparing for a “worst-case scenario” of up to 150mm this afternoon and this evening in some places – more than twice the 70mm average for the month of August.

We previously told how a 'danger to life' weather warning for Glasgow has been extended by the Met Office, with three days of severe thunderstorms set to batter the country.

Forecasters on Friday issued a yellow alert for the whole of Scotland on Monday and Tuesday, indicating a high chance of severe thunderstorms with flooding, lightning strikes and large hail also likely.

This has now been extended to include all of Wednesday.

The Met Office admit some 'uncertainty' regarding the exact locations and timings of the thunderstorms, but have applied the weather warning to the whole country for the duration of the period. 

READ MORE: Tributes paid after body of girl recovered from river by Balloch

They say there is a small chance that homes and businesses could be flooded quickly, adding there could be a potential "danger to life" as a result of fast flowing or deep flood water.

Members of the public are to expect delays and cancellations to public transport where flooding or lightning strikes occur, with difficult driving conditions also likely and an "increased chance of accidents."

Scots could also suffer power cuts during the worst bouts of weather.

Bonnie Diamond, a meteorologist with the Met Office, said: “We are looking at the potential for some thunderstorms there from about 4pm to the early hours.

“It’s a worst-case scenario – a caution, really, for what could happen – but we are looking at a potential for 150mm rain in three or four hours.

“Normally for August you’re looking at around 70mm for the month, so it’s potentially a lot of rain.

“To get that much it will take some areas seeing frequent thunderstorms, and not just passing through.”

The Met Office warning came as a 12-year-old girl died after going missing in the River Leven, near Balloch Bridge, Loch Lomond, in the west of Scotland on Sunday evening.

Her body was discovered by emergency services hours later.

And in England, a woman in her 30s died after getting into difficulties in the sea in Norfolk on Sunday.

HM Coastguard dealt with 340 incidents across the whole of the UK on Saturday – the highest number of call-outs in a single day for well over four years. There were a further 335 incidents on Sunday.