A boy missing in waters off Aberffraw is believed to be part of a family from Yorkshire, who were on holiday on Anglesey.
Our reporter Rob Shelley spoke to one of the men heading up the search this evening.
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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.