A SEVERE warning of rain has been issued for Newport and Gwent for tomorrow and Friday.
The yellow warning is in place from 11am on Thursday to 9pm on Friday.
Thunderstorms are also expected in some areas.
A Met Office spokesman said: "Thunderstorms are expected to move northwards into southern and some eastern parts of England during Thursday morning, with further heavy showers and thunderstorms developing across a wider area during the course of the afternoon and evening.
"Any thunderstorms over eastern England and the north Midlands will move through relatively quickly, but further south and west, they could become slow moving and lead to torrential rain in some places.
"There is the potential for 30-40 mm of rain to fall in an hour and perhaps as much as 60-80 mm in 2-3 hours. As well as this, frequent lightning and large hail are possible."
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