The giant ball that traditionally drops as part of New York's new year celebrations will have a new kaleidoscope design this year.
Organisers have been giving it a test run by throwing a switch that illuminates 32,256 lights embedded in 2,688 Waterford crystals.
At 6pm local time (11pm UK time) the ball will be raised to the top of a 130-foot pole at 43rd Street and and 7th Avenue in Times Square, and then lowered to usher in the new year.
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Paramedics attended a scene in Willesden, north-west London, on Monday afternoon where they found the teenager with stab wounds.
The popular game relies on Google Maps, a problem in South Korea as those functions are limited by the government.
A Met Office warning covering much of England and south-east Wales is expected to remain in place until 11am.