The Met Office has issued a yellow alert warning of possible heavy rain over Argyll and Bute on Tuesday and Wednesday.
The long spell of dry, warm weather looks set to be rudely interrupted over much of Britain, with the next few days seeing a mixture of sunshine and heavy, and at times thundery, showers over many areas.
In a yellow alert issued on Monday and covering all the local authority areas in west central Scotland, including Argyll and Bute, the Met Office said: “There is an increasing risk that many parts of England, Wales and Scotland will see thunderstorms or longer spells of thundery rain during the course of Tuesday, with some torrential downpours in places.
“The peak risk transfers northeastwards with time and will be clear of most central and southwestern areas by evening.
“The public should be aware of the risk of localised disruption to travel, and more generally to summer holiday activities, due to, for example, surface water flooding.
“An area of low pressure is expected to increasingly interact with the plume of hot, humid air resident across parts of southern Britain. Whilst preceding days will have seen relatively isolated thunderstorms, the developing set-up on Tuesday and early Wednesday, provides the ingredients for more widespread and energetic storms.
“Large rainfall totals, falling in short periods (perhaps exceeding 50 mm in three hours) and onto hard-baked ground, may lead to flooding locally, with hail and gusty winds an additional possibility.
“As is common in such situations, not everywhere will catch the heaviest of the storms, and some places may well escape altogether.”