(St. George, UT) -- Parts of southern Utah are under an Excessive Heat Warning from noon today through 9 p.m. Saturday with temperatures expected between 102 and 108 degrees. That warning is for Washington, Garfield, and Kane counties along with the Lake Powell area, while lower Washington County and south central Utah are under an excessive heat watch tomorrow afternoon. St. George and Lake Powell could hit 110 degrees, while Cedar City will be much cooler, with highs in the low 90s.