A heat advisory remains in effect from 11 a.m. Sunday through 11 p.m. Tuesday for much of northwest Oregon and southwest Washington, including the Central and Southern Willamette Valley.
The National Weather Service says temperatures are expected to reach 92 to 98 degrees. The advisory also includes the northern and central Oregon Coast Range valleys and mountains, the Cascade foothills, the Hood River Valley, the Central Columbia River Gorge, the Lower Columbia and Cowlitz River valleys, outer southeast Portland metro, parts of Clark County and the south Washington Cascade foothills.
Forecasters say the hottest days are expected to be Sunday and Monday, with only a slight cool down on Tuesday. Overnight temperatures are also expected to stay warm, with lows generally in the 60 to 65 degree range. In parts of the western Central and Southern Willamette Valley, there is a chance overnight temperatures could stay above 70 degrees Sunday night into Monday, limiting relief from the heat…