PORTLAND, Ore. (AP) — The heat spell scorching the Pacific Northwest is now expected to last longer than forecasters initially predicted. The National Weather Service has extended the excessive heat warning for Portland, Oregon from Thursday through Saturday evening. The NWS forecasts temperatures there to near 100 degrees for the next several days. The agency also predicts Portland could break its previous heat wave duration records of six consecutive days that are 95 degrees or warmer. Portland officials will expand capacity at emergency overnight cooling shelters starting Wednesday night. Oregon Governor Kate Brown has declared a state of emergency for much of the state.