The carnival, due to be held in July, is one of the country's biggest celebrations of Afro-Caribbean culture. But a community group objects to the way it is being run and that the main events will now be in Portland Square, outside St Paul's itself.
Artistic co-ordinator Julz Davies says he's stepping down because he says local people have not been kept informed.
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A mild evening will be overcast with wet spells. Some rainy patches will be heavy.
It will be mostly cloudy and mild with outbreaks of rain, some heavy. Windy, with gales possible in exposed areas.