Signing up for HNL Alert ensures you get more information, more quickly during an emergency. HNL Alert is the City and County of Honolulu’s mass notification system for O’ahu’s residents and and visitors. Choose the types events you want to be alerted about and how you want to be notified. Enter one or more addresses to get targeted alerts about events impacting specific areas you care about such as your home and workplace. 

HNL Alert is used in addition to warning systems that don’t require sign up, such as wireless alerts that sound on your mobile device, sirens, and alerts that interrupt radio and TV. While some warning systems are intended for urgent emergency situations, HNL Alerts can keep you informed about developing weather conditions and other situations affecting City services you rely on. HNL Alert messages can contain more details, include images and links to real-time information, and don’t disappear quickly from your device. You have more time to read and understand the information or share it with others.