Hurricane Sandy 'largest storm recorded in Atlantic'
Millions of residents of the northeast of the United States are bracing themselves for the arrival of Hurricane Sandy.
President Obama has urged residents of low-lying areas to heed warnings to evacuate their homes.
Experts are predicting Hurricane Sandy could be bigger than anything seen in the eastern states of America in decades.
David Shukman reports on a weather system that is already being referred to as a 'super storm'.