The emergency services will be tested today during an exercise at Wylfa nuclear power station on Anglesey.
The test will check the response of all the emergency services in the event of an incident involving the transport of radioactive material.
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September is expected to be confirmed as the driest on record, as well as one of the warmest ever.
Any mist and fog patches will clear this morning, with some warm spells of sunshine developing, especially in the east.