* WHAT...Temperatures up to 106 expected, with warm overnight lows in the upper 60s to low 70s offering little relief. * WHERE...Castle Country, Eastern Juab/Millard Counties, San Rafael Swell, and Great Salt Lake Desert and Mountains. * WHEN...From noon Saturday to 9 PM MDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.