* WHAT...Dangerously hot conditions with temperatures up to 105 possible and overnight lows in the low to mid-70s. * WHERE...Northern Wasatch Front, Salt Lake Valley, Tooele and Rush Valleys, Utah Valley, and Western Uinta Basin. * WHEN...From Saturday afternoon through Sunday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. Monitor the latest forecasts and warnings for updates.