The Met Office has issued a yellow weather warning for heavy rain and flooding, which is set to hit Hertfordshire later this week.
The warning is in place from 9pm on Thursday to 11.59pm on Friday, with 10 to 20mm of rain expected to fall, although it could be up to 50mm in some places across the south of England.
"Rain, heavy and persistent at times, is expected to develop through Thursday evening, before affecting much of England and Wales through Friday," according to the Met Office.
"Rain gradually clears from the north through Friday afternoon and evening.
"Widely 10-20mm of rain is likely, but in the wettest spots 30-50mm is possible, and some high ground of Wales especially could see 60 to 70mm.
"Across the south of the area its possible some thunderstorms may break out, and these could bring 20-30 mm of rainfall in a couple of hours."
The Met Office are also warning of "flooding on roads", while "flooding of a few homes and businesses is likely".
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