A subzero cold snap will continue for a week, according to the National Weather Service.
Arctic high pressure systems over North Dakota will bring subzero temperatures and dangerously low wind chill factors through the New Year, said Patrick Ayd, a meteorologist with the National Weather Service in Bismarck. A second arctic high pressure system will follow the current one on late Friday through the weekend, he said.
“It will be here a long time,” Ayd said. “We are looking at locked arctic air and potentially dangerous wind chills across the region most likely through New Year’s Day.”
There are signs that the system will move out by the first week of January, he said. At that time the temperatures might start to recover to Jamestown’s seasonal normal of around 20 degrees for early January, he said.
Christmas Day saw temperatures reaching minus 13 degrees. Expect highs of around minus 4 degrees on Tuesday with a wind chill factor of minus 35 degrees with west winds of 8 to 11 mph.
Overnight temperatures into Wednesday morning will drop to a low of around minus 17 degrees with a wind chill factor of minus 30, according to the Weather Service. A mostly sunny and cold Wednesday will bring a high near 3 degrees with light winds from the southeast.
"It will be here a long time.
meteorologist PATRICK AYD , National , Weather Service in Bismarck
There is a 50 percent chance of snow on Wednesday night with a low of around minus 4 degrees and southeast winds of 6 to 10 mph. There is a 30 percent chance of snow before noon on Thursday, with a high near 6 degrees and changing winds of 6 to 8 mph. The low overnight into Friday will be minus
The snow should not amount to much with a lack of moisture in the cold arctic air, Ayd said.
“It is not a major system but there is a potential for light accumulation,” Ayd said.
The weekend should brings highs near minus 3 degrees on Friday with a low around minus 18 degrees. On Saturday the high should be near minus 9 degrees with a low around minus 19 degrees.
The wind chill temperature is a measurement to approximate actual effect of the environmental cold on exposed skin, according to the Weather Service. The calculation starts with air temperatures of 50 degrees or less and wind speeds of 3 mph or more.
The U.S. Department of Labor states that outdoor workers exposed to cold and windy conditions are at risk of cold stress. Wind chill measures the rate that heat loss is expected on the human body from a combined low temperature and wind speed.