The warm pattern that has been in place since November 30th is coming to an end, to replaced by chilly, though not super cold temperatures. Here is the forecast for 3am Monday December 26th from the GFS. The dashed lines are 1000-500mb thickness, a measurable of the mean air temperature in the lowest half of the atmosphere. The 492 thickness contour right near Fairbanks (=4920 geopotential meters) is pretty cold and will easily support valley temps in the -40s and -50s IF and WHERE skies are clear. Regardless, this should be good for teens and 20s below at elevation.
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