The Dalles water-supply forecast at 84% of normal The Dalles inflows 38.6% below three-year average Mid-C August 336.5% higher than 2020 package The Dalles Dam water supply forecast is sitting 22 points below year-ago levels with the weather outlook indicating prolonged below-normal precipitation and above-normal temperatures, raising concerns over summer supply conditions and driving power forwards to record levels. Although March had cooler temperatures, April and May’s temperatures were above normal, combined with below-normal precipitation with the major of the region below 50% of normal, hydrologist Henry Pai said June 3 during the monthly Northwest River Forecast Center water supply briefing. Year-to-date precipitation levels are trending below normal across the Pacific Northwest. “It’s been a dry past three months,” Pai said. Snowpack and seasonal precipitation in the Upper Columbia is at 80% of normal, with […]