The Met Office has issued a weather warning as a band of heavy rain is expected to sweep across parts of the county on Thursday morning.
The yellow warning will be in place from 3am until 7pm on May 22.
Scattered heavy showers, with the risk of thundery downpours, are likely to follow during the afternoon.
The Met Office have also said the public should be aware of the risk of surface flooding.
Although it is uncertain which areas will be most at risk, downpours totalling more than 40mm are likely within some parts of the UK.
Our top stories: