A yellow weather warning for much of Scotland, including Tayside, has been issued for tomorrow (Tuesday) by the Met Office.
As the country basked in temperatures of up to 27c in some areas today (Monday) - making it the hottest day of 2016 for two days in a row - forecasters signalled torrential rain tomorrow afternoon which could spark traffic chaos during the afternoon rush hour in many places.
The Met Office warned: “Heavy, thundery showers will break out on Tuesday afternoon over parts of northern England and Scotland.
“These will be slow moving, and while many places will miss the worst, they will bring some localised torrential downpours.
“The public should be aware of the possibility of surface water flooding and travel disruption.”
The chief forecaster said: “Warm, moist air will turn unstable as the ground heats up, releasing heavy, thundery showers.
“Many of these will be over high ground, but will drift into lower-lying areas too. There could be more than 20mm in the hour locally, with more than 50mm in a few hours possible.”