Wales Forwards Coach Robin McBryde says Wales are confident on Sam Warburton's fitness, with Justin Tipuric ready to step in if the captain isn't available.
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The heaviest bursts are expected in the south and east, with some western areas either remaining dry or becoming dry by dawn.
Many places will start dry, but rain in the southeast will spread to most for a time overnight.
The family of Isaac Nash who went missing after being swept out to sea last summer have presented a cheque for £10,000 to the RNLI.