Three lanes are closed and there's slow traffic due to a multi-vehicle accident on the M4 eastbound between J20 M5 (Almondsbury Interchange) and J19 M32 (Bristol).
It's in the roadworks area just after the Almondsbury Interchange.
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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.