Watch these short videos to learn more about the All-hazard Statewide Outdoor Warning Siren System. Siren photos.   Siren fast facts. Hawaiʻi has the largest single integrated Outdoor Siren Warning System for Public Safety in the world. The all-hazard siren system can be used for a variety of  both natural and human-caused events; including tsunamis, … Continue reading All-Hazard Statewide Outdoor Warning Siren System