The westbound M4 is closed due to a serious accident between J18 the A46 (Bath/Tormarton) and J19 (M32 Bristol).
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It will be dry and bright in the morning but as the day goes on it will become wet and very windy.
Eastern parts will have heavy rain in the morning, clearing by afternoon.
Fire and Rescue Service says it received a 999 call to say there had been an explosion in a third floor flat within a mid terraced building.