Wirral has been placed on a yellow severe weather warning for heavy rain.
Up to 70mm of rain could fall across the area which could lead to severe flooding.
The Met Office warns that there is a small chance that homes and businesses could be flooded, causing damage to some buildings, with a small chance of fast flowing or deep floodwater causing danger to life.
A forecaster at the Met Office said: “Rain is expected to become heavy and persistent across parts of north Wales on Thursday, with many places seeing 20-30 mm of rain.
“Strong northeasterly winds are expected to bring large amounts of rain to north facing hills with the potential for 50-70mm of rain which may lead to some flooding.”
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