* WHAT. For the Heat Advisory, temperatures between 93 and 98 degrees expected. For the Extreme Heat Watch, dangerously hot conditions with afternoon temperatures between 90 and 100 degrees and low temperatures between 65 to 70 degrees possible. * WHERE. Western and Central Columbia River Gorge and the Hood River Valley, Portland Metro Lowlands, Greater Vancouver Metro, and Central Willamette Valley. * WHEN. For the Heat Advisory, from 11 AM to 10 PM PDT Sunday. For the Extreme Heat Watch, from Tuesday afternoon through Wednesday evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS. There is a 40-50% chance that Tuesday night low temperatures remain above 65 degrees and a 10% chance low temperatures remain above 70 degrees, which would limit overnight relief. The highest chances are in the Portland/Vancouver Metro Area and Columbia River Gorge. There is also 20-40% chance for high temperatures of 100 degrees or hotter across the Willamette Valley on Tuesday and Wednesday.
