There are delays of up to 30 minutes on Arriva Trains Wales and Crosscountry services between Gloucester and Newport because of flooding at Lydney.
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Cloudy with patchy rain or drizzle, possibly turning heavier for a time.
Organisers say there will be increased security at the Urdd National Eisteddfod, which began in Bridgend today.
Any remaining heavy or thundery showers will clear eastwards this evening.