Saturday will be sunny and cool across the region, but it will give everyone a chance to get out and about and to "winterize" your homes and cars for the big Arctic air mass that settles in on Monday. Highs today will top out in the lower 40s for most, but thankfully it won't be as windy as it was in Friday. It will remain quiet tonight with a mostly clear sky and lows back in the upper 20s to near 30° and most of Sunday, during daylight hours, looks dry as well.
The southerly wind on Sunday will also help to warm temperatures up into the upper 40s-lower 50s for most areas before the big shot of Arctic air Sunday night-Monday. As of right now, it appears as though the system will move across the Plateau Sunday night between 8-10pm Central Time starting as rain before quickly changing over to snow as the cold air rushes in. The rain to snow will move into the Valley between 10 p.m. and midnight and onto the mountains around 1 a.m. This timing is based on the current information we have, so please keep checking in for any changes in potential arrival times.
The system is expected to move though rather quickly, which should help to limit excessive snow totals, but as of now it appears as though this system could produce more snow than the one that came through Thursday Night.
The bigger impact of this front though will be the brutally cold temperatures that it will bring. Temperatures will fall from midnight Sunday highs of mid 20s down through the teens during the day Monday and bottom out in the low single digits to near 0° by Tuesday morning. These temperatures will most likely set record lows for many locations as Knoxville's record for January 77th is 6° set in 1970.
This cold snap will could keep temperatures below the freezing mark for 60+ hours before we finally see a thaw after the middle of next week.
Today: Sunny and cool. High: 44°.
Tonight: Mostly clear. Low: 30°.
Sunday: Clouds increase through the day, breezy and warmer. High: 52°.
Sunday Night: Rain quickly changes to snow (100% coverage). Midnight temperatures in the mid 20s then falling overnight.
Monday: Variably cloudy, breezy and very cold as temperatures continue to fall through the teens.