Heat Advisory

* WHAT...Hot conditions with high temperatures up to 90 to 100 degrees and low temperatures down to 60 degrees expected. This will pose a moderate risk of heat-related illness.

* WHERE...Middle Chehalis River Valley, Lowlands of Lewis and Southern Thurston Counties, Olympia and Southern Puget Sound, and Willapa and Black Hills.

* WHEN...From 11 AM Sunday to 5 AM PDT Tuesday.

* IMPACTS...Heat will significantly increase the risk of heat-related illnesses for those who are sensitive to heat, especially those without effective cooling or adequate hydration.

* ADDITIONAL DETAILS...The warmest daytime high temperatures are expected Monday afternoon and the warmest overnight lows are expected Monday night into Tuesday morning. Areas away from water may see localized areas of major HeatRisk.