The Met Office has issued the alert, which will begin which comes into force from 9am on Saturday 20, to 6am on Sunday, September 21. The warning suggests heavy rainfall may cause some transport disruption and flooding. From mid-Saturday onwards, increasingly strong gusty winds and perhaps some thunder will also accompany the rainfall, further increasing the risk of disruption. By the early hours of Sunday, persistent heavy rain will have likely cleared from Wales, with this rain easing for Northern England and Scotland by dawn on Sunday morning. Residents are advised to be prepared for weather changes and check the driving and transport conditions before travelling.