A tropical heatwave spread over middle Minnesota this weekend, blanketing us in highs in the upper 20's and lower 30's (currently 34 in the cities). Of course, this warm, windless air over a blanket of snow meant a thick, pervasive fog Sunday that persisted from morning til night in some regions, particularly around Little Rock and Foley. Made for some beautiful hoarfrost as the moisture-laden air froze on trees overnight.