After a bitterly cold day in the forum region(wind chills here in Kingsport ranged in the single digits this AM to lower 20s this afternoon), tonight will harbor the concerns that many have expressed regarding the Feb spring warmth...a long duration overnight hard freeze w lows in the mid-teens. This would be impressive for all but the coldest climo days of Jan. Here is the AFD from MRX...
.SHORT TERM /Tonight through Thursday/...
A cold, northwest wind will continue reinforcing a bitterly cold
arctic air mass. The combination of a clear sky and this cold air
will allow temperatures to plummett after sunset well below
freezing -- eventually bottoming out into the mid teens to lower
20s across the Valley. A freeze warning is in effect to address
this potential for a widespread, killing freeze. In addition,
winds along the East Tennessee Mountains will remain in the 10 to
15 mph range, and combined with bitterly cold air cause wind chill
values to drop to dangerously low levels in the -5 to -15 degree
range. By late morning these products will expire as temperatures
warm due to solar heating. A warmer day is expected as highs will
peak in the 40s to lower 50s.