* WHAT...Hot conditions with high temperatures up to 85 to 90 degrees and low temperatures down to 60 degrees expected. This will pose a moderate risk of heat-related illness. * WHERE...Eastern Kitsap County, Eastern Strait of Juan de Fuca, Lowlands of Western Skagit and Northwestern Snohomish Counties, Lowlands of Western Whatcom County, Northern Hood Canal, Port Townsend Area, Southern Hood Canal, Downtown Everett / Marysville Area, and Shoreline / Lynnwood / South Everett Area. * 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.