Following the coldest opening week to a January in history and 3rd longest sub 32 stretch, NYC amongst other major cities are shooting for 60 degrees ahead of another powerful arctic front poised to drive temps 30-40 degrees within 12 hours.

https://twitter.com/NWSNewYorkNY/status/950710051890761729

https://twitter.com/NWSNewYorkNY/status/950714080834281477

Up it goes then down it goes for NYC.

Even Chicago is expected to hit 60 today. Wow

https://twitter.com/NWSChicago/status/951428144115929089

Then in comes the cold again.

Warmth has dominated the 2017-18 winter in Alaska so far but as is often the case, once the Lower 48 sees the return of a mild Pacific flow and warmer air lifting north, so the trough and cold returns to Alaska.

Chicken, AK observed the states lowest temperature of the season so far with a low of -54F yesterday morning.

https://twitter.com/Climatologist49/status/951174240132190208

Meanwhile across the border into Northwest Territories and we see Canada’s first -50C (-58F).

https://twitter.com/Pat_wx/status/951492625009446914

https://twitter.com/GregPostel/status/951459115225755648

A major storm system is gathering force now between the very mild, almost spring-like moisture rich air sweeping north and frigid cold diving south straight from the core of the -50C air over NWT.

https://twitter.com/weatherchannel/status/951444977036480513

https://twitter.com/weatherchannel/status/951251108558704642

https://twitter.com/GregPostel/status/951469178980061184

https://twitter.com/StuOstro/status/951534414059712512

Check out the mild ahead and cold which follows for NYC

https://twitter.com/TomNiziol/status/951455958143832065