Deseret News Share this story Kristin Murphy, Deseret News Get ready for the heat. The National Weather Service on Thursday extended excessive heat warnings across Utah as several cities and towns across the state are expected to break high-temperature records Thursday and Friday. The weather service's first excessive heat warning was issued for the southern portion of Washington County and the Lake Powell area, also in southern Utah. It includes the communities of Big Water, Bullfrog, Hurricane, Ivans and St. George. It goes into effect noon Thursday and remains in effect to 10 p.m. Saturday. Related A second excessive heat warning was issued for most of the Wasatch Front and also Utah's western desert, including the communities of Bountiful, Dugway, Lehi, Ogden, Park Valley, Payson, Provo, Salt Lake City, Sandy, Wendover and West Jordan. It goes into effect from Friday at noon and will last until 6 a.m. Saturday.