Blizzard conditions are expected to “engulf” parts of Colorado, Wyoming, Montana, Nebraska and South Dakota, British travellers to the US have been warned.
Heavy snow is falling in northern Arizona while hurricane-force winds of up to 100mph are forecast across New Mexico, Texas, Kansas and Colorado.
The storm affecting western and central states has grounded flights, particularly in Denver, the Foreign and Commonwealth Office warned in a travel advisory issued last night.
More than 1,300 flights are reported to have been cancelled at the Colorado hub.
Denver International airport last night said it was is experiencing snow, heavy winds and poor visibility.
“As a result, the majority of flights have been cancelled and all six runways are closed, but the terminal and concourses remain open,” the airport added.
The FCO said: “These hazardous weather conditions have led to power outages and travel disruption.
“A substantial number of flights have been cancelled in the most affected areas, particularly Denver, Colorado.
“More than 100,000 customers are without power in Texas.
“If you are in an affected area or due to travel, you should monitor local media and follow the advice of the local authorities.
“If you are planning to travel to or from an affected area, you should check with your airline or transport provider before starting your journey.
“You can check forecasts and weather warnings on the US National Weather Service website.”
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