Published: 11:00, 17 July 2017
The county could see up to 30mm of rain in an hour after a severe weather warning was placed on the county.
The warning, which comes into force at around 5pm tomorrow evening and lasts throughout the rest of the day, could see flooding and scattered thunderstorms.
A Met Office spokesman said there was a "chance of localised flooding of homes, businesses and susceptible roads.
"Frequent lightning may be an additional hazard with potential disruption to power networks. Similarly, but very locally, hail may cause impacts."
Some places will miss the intense downpours, but when they do hit they could cause 20 to 30mm of rain in an hour.
This could lead to surface water flooding, particularly across urban areas.
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