- Volcano Watch: Grimsvotn, an explosive volcano in Iceland is now under an increased alert level, following an earthquake swarm and releasing a glacial flood. The volcano was already near an eruption, creating an aviation risk from an ash cloud release into the North Atlantic region. https://www.severe-weather.eu/news/volcano-grimsvotn-iceland-earthquake-swarm-eruption-alert-2021-fa/ 3 comments worldnews