"For this type of event, the ten campuses of the University of Hawaii will rely on the Hawaii Emergency Management Agency siren system and follow agency instructions on 'sheltering in place, '" the email said.
"In the event of a nuclear attack", it said.
In July, Hawaii became the first state to announce a public campaign urging those living there to prepare for a nuclear attack.
The unusual nature of a university system alerting its constituency to the possibility of a North Korean attack attracted the attention of national and worldwide media, including The Washington Post, Fox News, CBS News and the Daily Mail of London.
"In the last two years, there was 56 missile launches", Hawaii state Rep. Gene Ward said.
North Korea's foreign minister said on September 21 that there may be a hydrogen bomb test in the Pacific Ocean, Yonhap news agency reported, after dictator Kim Jong Un vowed to take the "highest-level" action against the United States. "We have no idea about what actions could be taken as it will be ordered by leader Kim Jong-un".
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North Korea may fire a batch of short-range missiles next week, according to multiple reports. Some in attendance noted the meeting wasn't called because of a specific, immediate threat to Hawaii; however, "recent regional military threats" prompted plans for a proper response when needed.
If North Korea were to attack Hawaii, it's likely target would be Honolulu. Officials believe there would be up to 15,000 casualties.
Experts believed North Korea would launch a missile October 10, which was the country's annual public holiday, Party Foundation Day, CNBC reported.
However, it mentioned concerns over the current missile tests being launched by Kim Jong-Un in North Korea.
The sanctions include a ban on the sale of natural gas liquids to North Korea and limitations to the sale of crude oil and refined petrol products.
North Korea has repeatedly threatened to strike the US mainland, even vowing to strike the USA territory of Guam with four medium-range ballistic missiles in August, though Pyongyang later backed away from the brink.