The Defence Secretary has confirmed that the 14th Signal Regiment will leave their base at Cawdor Barracks in Brawdy, Pembrokeshire. The 600 military personnel will move to the former RAF St Athan site in the Vale of Glamorgan.
Phillip Hammond announced the changes as part of a major reorganisation of army bases in the UK.
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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.