Hourly Weather - Sindelfingen, Germany

At a Glance Volcanic ash can cause shifts in ecosystems.Seawater enhances the effects.Aid groups say most of Tonga's population was impacted by the eruption. A toxic "cocktail" of volcanic ash, gases and seawater involved in the massive volcanic eruption near Tonga Friday could threaten the region's water, food sources and other aspects of the environment, according to Cornell University researchers working on a NASA-funded study. "Volcanic ash can contain both pollutants and nutrients, which can in dramatic ways," Natalie Mahowald,...