Emergency rules adopted under sections 97A.0451 to 97A.0459 shall be effective for the period stated in the notice of intent to adopt emergency rules which may not be longer than 180 days. The emergency rules may be continued in effect for an additional period of up to 180 days if the commissioner gives notice of continuation by publishing notice in the State Register and mailing the same notice to all persons registered with the commissioner to receive notice of any rulemaking proceedings. The continuation is not effective until these notices have been mailed. No emergency rule may remain in effect on a date 361 days after its original effective date. The emergency rules may not be continued in effect after 360 days without following the procedure of sections 14.14 to 14.28.