The coldest air since last winter is set to move over the Plains and the East during the first half of the new week.
The core of the cold air will focus over the northern Plains and the Great Lakes through at least Wednesday with overnight lows dipping down into the teens, and even the single digits in some normally colder spots.
Bone-chilling nights will be followed up by frigid days with highs struggling to reach the 20-degree mark over the regions on Monday and Tuesday. Some locations are forecast to stay below 20 F until Wednesday afternoon, including Minneapolis, Minnesota.
A significant lake-effect snow event will set up downwind of the Great Lakes as the arctic air blows over the comparatively warm waters of the lakes.
The stage is set for feet of snow to pileup in some communities downwind of the Great Lakes. In some cases, the heaviest snow squalls in these areas can produce thunder and lightning.
Gusty winds will blow around the fresh snow, creating large drifts and near-blizzard conditions at times. Such hazardous conditions will set up in Buffalo, New York, and Erie, Pennsylvania, for a time.
http://www.accuweather.com/en/weather-news/harsh-cold-to-freeze-northeast/37451243
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