The tsunami watch issued for Haida Gwaii and other parts of BC coast was upgraded to an advisory just before 2:00 BC time. A tsunami, if one occurs, would hit the BC coast around 7:30 am Friday.The Pacific Tsunami Warning Center in Hawaii earlier widened its tsunami warning to include Hawaii and the rest of the Pacific Ocean, then an advisory notice was issued for west coast of North America, including Haida Gwaii.Sirens were sounded in Honolulu shortly after the warning was issued Thursday at 9:31 p.m. Haiwaii time.The warning follows a massive earthquake that has struck off the northeastern coast of Japan.It says the estimated earliest arrival in Hawaii of the first tsunami wave is 2:59 a.m. local time time Friday (7:59 a.m. ET)."A tsunami has been generated that could cause damage along the coastlines of all islands in the state of Hawaii," the Pacific Tsunami Warning Center's bulletin said. "Urgent action should be taken to protect lives and property."A tsunami watch was also issued for the coasts of Oregon, Washington and California as well as parts of Alaska and Canada, the Oregonian newspaper reported. The paper said any wave which reached the coast could hit just before 7:30 a.m. local time Friday.The warning also includes Australia, New Zealand, Mexico and Central and South America.Tsunami warnings are issued due to the imminent threat of a tsunami.This is a breaking news story. Please check back for updates.