Four emergency weather shelters will open Wednesday at 8 pm in Portland as the region plunges into frigid winter conditions. While daytime temperatures are expected to sit in the 30s and 40s, overnight temperatures could be life-threatening for people living outside. The National Weather Service issued a wind chill advisory Wednesday night into Thursday, predicting a low of 23 degrees and a small chance of snow. Multnomah County Chair Jessica Vega Pederson and Mayor Ted...