Heavy rain could lead to flooding and travel problems in Flintshire, the Met Office has warned.
A Met Office yellow warning - advising people to be aware - covers areas of Flintshire.
It is in place from 6pm on Monday until 10am Tuesday.
Heavy showers are predicted to move in from the Irish Sea and could lead to up to 40mm (1.6 inches) of rain falling in some areas.
The Met Office warns flooding of 'a few homes and businesses is likely', bus and train services may be affected and that drivers should watch out for spray and flooding on roads.
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