The leader of the Hawaii National Guard disclosed the timetable at a hearing on Friday. Lawmakers want to know why the public was not told quicker.
A state official says the employee who erred should not pay the price for a system that “made it too easy for a simple mistake to have very serious consequences.”
The false alarm and its delayed retraction added to criticism of Gov. David Ige and raised worries about the state’s reputation with tourists.
The alert appeared on cellphones warning people to “seek immediate shelter,” and said, “This is not a drill.” The authorities said it was a false alarm.
Monthly tests are the latest in similar readiness steps by Hawaii amid renewed tensions between the United States and North Korea.
Randall Saito, who was acquitted of murder by reason of insanity, managed to clear airport security and fly across the Pacific before being apprehended.