Another surge of Arctic air will push the mercury to its lowest levels so far this season. Single-digit lows will be in place on Thursday morning, and highs will only reach the low to middle 20's. We'll turn around on Friday with highs pushing into the upper 30's to near 40, only to crash back down into the 20's on Saturday morning. A wintry mix will be possible Friday night, mainly north of the Ohio River. Still to early to forecast accumulations.