Big waves have forced the closure of several beaches

The alert is in force from Cornwall to Dorset with specific warnings targeting Weymouth and Christchurch Harbours up to the Stour and Avon rivers.

Residents in flood-prone areas have been advised to use sand bags and floorboards to protect their property.

Ferry services in Cornwall were affected, and several beaches closed.

Coastguards have been warning onlookers to beware of large waves.

Conditions were "very dangerous," said a Falmouth coastguard spokesman.

Across the south, motorists have been contending with fallen trees and branches caused by the high winds.