ATLANTA — A line of rain and snow mix moved quickly through north Georgia and metro area, but some of the coldest temperatures of the year are right behind it.

Temperatures will continue to fall into low 20s overnight.

We have our Severe Weather Team 2 meteorologists using the most advanced weather technology to track the falling temperatures on Channel 2 Action News.

Severe Weather Team 2 Meteorologist Brad Nitz said that patches of black ice will be possible in some areas.

Fannin, Gordon and Union counties have all delayed schools two hours on Wednesday morning. Fannin County government will also be delayed until 10 a.m.

[FULL LIST: School and Business Closings]

A Winter Weather Advisory was canceled for metro Atlanta and most of north Georgia Tuesday morning, but remained in effect for Habersham and Rabun counties through 7 p.m.

Our Severe Weather Team 2 Meteorologists tracked the line of winter weather as it moved across the country for the last week.

The switchover from rain to snow began happening around 6:30 a.m. in Dade and Walker counties in far northwest Georgia. By the afternoon, the system had pushed through.

Channel 2's Rikki Klaus found some light accumulating snow in Blue Ridge. Fannin County officials are preparing the roads as there is a potential of black ice on back roads.

[PHOTOS: Snow falls across parts of north Georgia]

TIMELINE AND IMPACTS:

TUESDAY EVENING AND WEDNESDAY

Overnight, temps will fall into the low 20s and some areas will wake up into the teens Wednesday morning.

A Wind Chill Advisory is in effect for parts of northeast Georgia until 11 a.m. Wednesday.

Wednesday and Thursday will be dry and cool with highs in the 40s. Highs return to near normal Friday in the lower 50s.

[DOWNLOAD: Free Severe Weather Team 2 App]

Super Bowl Sunday could be a little damp as scattered showers develop. Sunday's chance of rain is currently 40 percent.

[WATCH: How to drive if you hit black ice]

Cox Media Group