Junior Home Office minister James Brokenshire has replaced Mark Harper as Immigration Minister, who resigned after discovering that his cleaner was in Britain illegally.
Karen Bradley will move from the whips office to fill Mr Brokenshire's role.
Ms Bradley will be succeeded by John Penrose within the whips office, and Harriet Baldwin will be brought into the government as a junior whip.
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Cloud and outbreaks of rain will ease away eastwards during the morning, clearing the east coast around midday with sunny spells developing.
Police and emergency services are attending the scene.
Rebel-held east remains at risk while the pumping station supplying the western part of the city is once again in operation.