The Met Office has issued an Adverse Weather Alert to take effect from 10 am on Wednesday to 8pm on Thursday.
It has raised the alert level to yellow.
It says periods of rainfall and thunderstorm activity are likely.
Street/flash flooding, gusty winds and landslides/landslips are possible near heavy showers and thunderstorms.
The Met Office says this activity is associated with the ITCZ and conditions may become intense during the outlined period.
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