* WHAT...High temperatures ranging from 99 to 106 degrees with warm overnight lows between 62 to 70 degrees. Widespread Moderate HeatRisk with areas of Major HeatRisk in lower valleys. * WHERE...Western Nevada Basin and Range including Pyramid Lake and Mineral and Southern Lyon Counties. * WHEN...Until 8 AM PDT Sunday. * IMPACTS...Heat-related illnesses will be more likely, especially for those spending extended periods outdoors, in poorly cooled indoor spaces, or who are sensitive to heat.