A yellow weather alert has been issued for Helensburgh and Lomond by the Met Office.

The warning for thunderstorm will begin at 1pm on Monday afternoon (May 6) and last until 9pm across parts of the west side of Scotland.

It is expected that up to 20 to 40mm of rain will fall in some places in just "an hour or two", meaning that flooding is also likely.

Forecasters added that “there is a chance of delays and some cancellations to train and bus services” and “a slight chance that power cuts could occur”.

It warns that there’s a small chance of flash flood, and a danger to life from fast flowing or deep floodwater.

The Met Office have also said that there is a small chance that some communities become cut off by flooded roads.

A Met Office spokesperson said: "Thunderstorms and heavy downpours are likely to break out in some places this afternoon and evening.

"Although not all places will catch these storms and downpours, where they do occur 20 to 40 mm rain may fall in some places in an hour or two."

Updates and safety advice can be found on the Met Office website at metoffice.gov.uk.