SOAKING Sunday will give way to Monsoon Monday as parts of Scotland suffer half a month’s worth of rain in just over 24 hours.
The build-up of rainfall – possibly half a foot in some places – is expected to spark landslides and terrible driving conditions on the roads.
Transport officials are considering closing the A83 at the Rest and Be Thankful in Argyll where the hillside above the road will become saturated by some of the worst downpours.
The Met Office has issued a 27-hour warning from 6pm this evening until 9pm on Monday for a wide area of the west of Scotland, north of Glasgow.
Forecasters say a band of rain will begin moving north later today, carrying more moisture than normal due to warm air blowing up from the southwest.
Usually, this would exit the north coast but cold air over the Northern Isles will act like a wall, deflecting the rain back down south.
As a result, areas already hit by downpours will receive a second soaking into Monday evening.
Tom Morgan of the meth The office said this is when the worst disruption can be expected, as rainfall totals build hour-by-hour.
He said: “You are looking at half a month’s worth of rain in just over 24 hours.
“You can expect flooding and some road closures by Monday evening.
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Landslips are possible due to the sheer volume of rain we can anticipate.
“Anyone thinking of traveling in the affected area, particularly later on Monday, should pay attention to the warnings we have issued.”
In the affected area, the alert suggests around three inches of rain could fall before the warning period ends.
However, in places like Argyll, Lochaber and Wester Ross, there is a chance that half a foot could fall.
As a result, the Met Office says there is a chance some homes and businesses could be flooded, with subsequent damage to property.
Delays and cancellations of bus and train services are expected and some communities could become cut off by flooded roads.
The warning states: “A lengthy period of rain looks likely to develop across parts of western Scotland on Sunday and Monday.
“Initially, rain will slowly push north through Sunday before pivoting and then returning south later on Monday.
“Some southern parts of the warning area may see a drier interlude for a time on Monday and there is some uncertainty as to how far north the rain gets.
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“Around 40-75mm (3 inches) of rain may fall quite widely in the warning area but there is the potential for 120-170mm (more than 6 inches) in the wettest areas, perhaps most likely in parts of Argyll, Lochaber and Wester Ross.”
Cal Mac and ScotRail have warned passengers that some services could be delayed or canceled due to the conditions.