Lives could be put at risk in the UK and parts of the British Isles as Storm Ciarán hits, forecasters have warned.
Powerful winds and rain are already lashing southern England and gusts of up to 95mph (152km/h) are expected to hit the Channel Islands.
The Met Office has warned of travel disruption and damage to buildings, prompting the declaration of a major incident in Hampshire.
Storm-force gusts, heavy rainfall and coastal flooding are expected in the Channel Islands, where conditions could be some of the worst seen in decades and flood defence measures have been put in place.
Yellow and amber warnings for wind and rain – indicating potential risks to life and property – have been issued by the Met Office for parts of England and Scotland.