Some 300,000 people were without power from Missouri to Kentucky to Virginia, while more than 1,500 flights were cancelled and hundreds delayed, according to tracking websites Poweroutage.us and FlightAware.
The National Weather Service (NWS) was predicting up to a foot of snow in Washington, where Congress was set to forge ahead with the certification of Donald Trump's election victory, four years to the day after his supporters stormed the US Capitol to try to overturn his 2020 loss.
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