Dramatic warming trend underway

AUSTIN (KXAN) -- A warming trend is underway as sunshine and south winds return to the area, following a brief taste of winter Tuesday morning. Morning low temperatures Tuesday nearly dropped to the freezing mark in the coldest rural valleys.Daytime and nighttime temperatures warm steadily this week until record heat returns Saturday. Forecast high temperatures for Formula One races at COTA will be unseasonably hot with dry sunshine. PHOTOS: Solar eclipse passes over Austin areaExtended forecast