The beast from the east has reached the UK and with snow settling in the capital, there has also been a batch of travel disruption today.
Transport for London reported severe delays across several Tube lines, while TfL Rail and London Overground also had delays. By lunchtime, this had improved in some places, though the Central and Piccadilly Lines and the London Overground still face severe delays. There are also minor delays on the District line.
Bad weather has caused some of the problems while faulty trains and signal failures are causing some of the others.
Here's a roundup so far:
Piccadilly: Severe delays due to emergency engineering work at King's Cross earlier. Tickets are being accepted on local buses.
London Overground: Severe delays Euston to Watford Junction due to signal failure. Severe delays between Stratford and Richmond and minor delays Willesden Junction to Clapham Junction due to a faulty train.
District: Minor delays Edgware Road to Wimbledon, Earls Court to Richmond and Ealing Broadway due to an earlier signal failure at West Kensington.
Central: Severe delays between North Acton and Ealing Broadway / West Ruislip and between Leytonstone and Epping / Hainault and minor delays on the rest of the line due to earlier faulty trains.
Check here for the latest.
Tackling disruption from cold weather:
TfL said ahead of the bad weather, it would work to keep the rail and strategic road networks open and running - including key arterial roads, cycle routes and footways around bus and railway stations, hospitals and police, fire and ambulance stations.
Between TfL and the London boroughs, more than 100,000 tonnes of salt are available at key locations across London for gritting. Trains on the Underground are also de-iced overnight to keep tracks as clear as possible.
Rail services affected
Elsewhere, the rail network more widely is being affected by the wintry weather. Greater Anglia services are affected with no services between some routes, and Virgin Trains are being disrupted between Motherwell and Carlisle.
For more detail on the rail roundup of travel disruption, check here.