Tsunamis pose a threat to our nation’s coastal communities and can have devastating impacts to lives and property. These powerful forces of nature can be caused by events like earthquakes, landslides, and even volcanic activity like the January 2022 eruption in the Tonga Islands region. Although they can’t be stopped, detecting and monitoring these waves when they occur can help warn the public of possible danger. In this episode, we speak with Paul Fanelli, Lead Oceanographer for NOAA’s National Ocean Service, Center for Operational Oceanographic Products and Services to learn how water level stations provide critical data to help issue alerts, and about the unique wave caused by the Tonga eruption.