Some of the coolest temperatures of the season so far will be possible overnight across portions of northeast South Dakota and west central Minnesota. The combination of clear to partly cloudy skies, light winds and a dry air mass will lead to overnight lows dipping to the mid to upper 30s. These conditions will lead to the potential of patchy to areas of frost by daybreak Friday. The best chances for seeing frosty conditions will be across the far northeast corner of South Dakota and west central Minnesota where skies will remain clear for a longer period of the overnight.