Las Vegas woke up to a city blanketed in snow this morning, the first time significant snowfall has been recorded in the area since records began in 1937.
The National Weather Service (NWS) reported that 25mm of snow had fallen at McCarran International Airport by 4am on Thursday (NZDT 1am Friday).
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NWS said the 13mm of snow that had accumulated by late Wednesday afternoon was the "first measurable snow since the record-keeping started."
The weather service has issued a warning to Las Vegas valley residents that snow showers may be on-going, with another 250mm of snow expected to fall by tomorrow.
The US was hit with a polar vortex at the end of January, which plummeted temperatures in some parts of Midwest USA to -35degC.
9News Australia said the wintry weather will affect around 100 million Americans as snow, rain and flooding sweeps across the country.