Hawaiian officials aren’t taking North Korean dictator Kim Jong Un’s threats lightly, implementing monthly “attack warning” sirens to notify citizens and tourists of an unexpected nuclear strike on the United States.

According to the Honolulu Star Advertiser, the warnings will begin on December 1st at 11:45 in the morning, and will be tested on the first business day of each month. The state’s “steady-tone alert” will blast for 50 seconds, followed by a brief silence, then another 50 second “attack warning tone” signaling an impending missile strike.

Hawaii’s Emergency Management Agency released the details of the system, including a sample of the warning tone. Executive Officer Toby Clairmont praised the new alert, saying the previous time Hawaiians heard an “attack siren” was in 1980 when tensions between the United States and Soviet Union were approaching a breaking point.

“The Russian threat, now far more removed, has been replaced by the unpredictability of North Korea, which exploded a nuclear device Sept. 3 that may have had yielded 250 kilotons or more,” writes the local paper.

“For the foreseeable future, the additional monthly attack warning sirens will be the new norm statewide,” adds the author.

Listen to the new warning system below: