Heat Advisory

* WHAT...For the Heat Advisory, high temperatures of 100 to 105 degrees with overnight lows of 64 to 72 degrees. Widespread Major (level 3 out of 4) HeatRisk across lower valleys. For the Extreme Heat Warning, high temperatures of 101 to 106 degrees with overnight lows of 67 to 74 degrees. Widespread Major (level 3 out of 4) HeatRisk and isolated Extreme HeatRisk (level 4 out of 4) in lower valleys.

* WHERE...Western Nevada Basin and Range including Pyramid Lake.

* WHEN...For the Heat Advisory, until 8 AM PDT Friday. For the Extreme Heat Warning, from 8 AM Friday to 8 AM PDT Monday.

* IMPACTS...For the Heat Advisory, 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. For the Extreme Heat Warning, heat related illnesses increase significantly, particularly for those working or participating in outdoor activities.