Forecasters have issued a thunderstorm warning which covers a large part of Scotland, including the Falkirk area.
The alert comes into force from 10am on Friday August, 6, and lasts until 9am on Saturday August, 7.
Residents have been told to prepare for flooding and travel disruption.
As much as 20-30 mm of rain could fall, with the potential of 80-100 mm in some places.
A Met Office spokesperson said: "Heavy showers are expected across much of the UK on Friday.
"Within the warning area these showers and thunderstorms will be slow moving and may cause localised surface water impacts.
"Rainfall totals will vary considerably and not all locations will be affected by the heaviest showers.
"However, where the showers do occur there is potential for 20-30 mm of rain in a short space of time and during the course of the day there is a chance that some places could see as much as 80-100 mm build up."
