Rail services across most of southern Britain have been cancelled or are running to amended timetables because of fears for passenger safety, debris on railway lines and damage to infrastructure.
Some services are not operating at all until late morning and Network Rail is advising passengers to allow extra time to reach their stations and to catch connecting trains because road conditions are also expected to be hazardous.
Both Severn crossings, the M4 and the M48, have been closed because of high winds, as has the southbound lane of the Queen Elizabeth II bridge on the M25, part of the Dartford River Crossing between Essex and Kent.
Among the rail operators, First Capital Connect said it was not expecting to run a service until 9am, and then to an amended schedule, while Southeastern will run an amended timetable with the possibility of services not starting until 9am or 10am.
First Great Western will have an amended timetable until 10am, with just one train an hour on services between London Paddington and Swansea and Bristol Temple Meads, while Southern and Gatwick Express services will not run before 9am, and only with amended services after that.
South West Trains said it expected to run an amended timetable, with no trains before 8am, and was only running trains at a maximum of 50mph because of high winds. Transport for London said there will be no service on the Overground line until 9am
On the roads, while the Dartford River Crossing is closed the tunnel part of the crossing is expected to remain open and will operate in contraflow (one tunnel running in each direction) to allow traffic to still get across the Thames