Regional Tsunami Warning/Watch Bulletin
Regional Tsunami Warning/Watch Bulletin : Message issued initially by PTWC based only on seismic information to alert all participants of the possibility of a tsunami and advise them that a tsunami investigation is underway. Those areas that are within 0 to 3 hours from the estimated time of arrival of the first wave are placed in a Tsunami Warning status. Those areas within 3 to 6 hours are placed in a Tsunami Watch status. It will be followed by additional bulletins until it is either upgraded to a Pacific-wide Tsunami Warning or until it is cancelled Warning/Watch Bulletin issued by the PTWC
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