The Hawaii Emergency Management Agency and the Honolulu Department of Emergency Management today will test the warning siren at the Hoopili development.
The testing will occur between 9 and 11 a.m.
New developers are required by the Land Use Commission to establish outdoor warning siren coverage for public safety where there is no coverage.
Nearby residents may hear the siren sound six to eight times for varying durations.
Emergency management officials and technicians will check the siren to make sure it is properly working.