The warning was ominous, its predictions dire: Oceanographers issued a bulletin telling Hawaii and other Pacific islands that a killer wave was heading their way with terrifying force and that ``urgent action should be taken to protect lives and property.''
But the devastating tidal surge predicted after Chile's magnitude 8.8-earthquake for areas far from the epicenter never materialised. And by Sunday, authorities had lifted the warning after waves half the predicted size tickled the shores of Hawaii and tourists once again jammed beaches and restaurants.
Scientists acknowledged they overstated the threat but defended their actions, saying they took the proper steps and learned the lessons of the 2004 Indonesian tsunami that killed thousands of people who didn't get enough warning.
``It's a key point to remember that we cannot under-warn. Failure to warn is not an option for us,'' said Dai Lin Wang, an oceanographer at the Pacific Tsunami Warning Center in Hawaii. ``We cannot have a situation that we thought was no problem and then it's devastating. That just cannot happen.''
Hundreds of thousands of people fled shorelines for higher ground Saturday in a panic that circled the Pacific Rim after scientists warned 53 nations and territories that a tsunami had been generated by the massive Chilean quake.
It was the largest-scale evacuation in Hawaii in years, if not decades. Emergency sirens blared throughout the day, the Navy moved ships out of Pearl Harbor, and residents hoarded gasoline, food and water in anticipation of a major disaster. Some supermarkets even placed limits on items like Spam because of the panic buying.
At least five people were killed by the tsunami on Robinson Crusoe Island off Chile's coast and huge waves devastated the port city of Talcahuano, near hard-hit Concepcion on Chile's mainland.
But the threat of monster waves that left Hawaii's sun-drenched beaches empty for hours never appeared _ a stark contrast to the tidal surge that killed 230,000 people around the Indian Ocean in 2004 and flattened entire communities.
This time, waves of more than 5 feet were reported in Kahului Bay in Maui and in Hilo, on the eastern coast of Hawaii's Big Island, but did little damage. Predictions of wave height in some areas were off by as much as 50 percent.
In Tonga, where up to 50,000 people fled inland hours ahead of the tsunami, the National Disaster Office had reports of a wave up to 6.5 feet (1.98 meters) hitting a small northern island, with no indications of damage.
And in Japan, where authorities ordered 400,000 people out of coastal communities, the biggest wave was a 4-foot (1.22-meter) surge that hit the northern island of Hokkaido, flooding some piers.
After the Pacific Tsunami Warning Center lifted its warning, some countries kept their own watches in place as a precaution. Early Monday, the Japan Meteorological Agency warned of a possible tsunami about a foot and a half in size along its entire Pacific coast and told people to stay away from the waterfront. That warning was
cleared later Monday morning.
Scientists offered no apologies for the warnings and defended their work, all while worrying that the false alarm could lead to complacency among coastal residents _ a disastrous possibility in the earthquake-prone Pacific Rim.
A similar quake in Chile in 1960 created a tsunami that killed about 140 people in Japan. The same surge hit Hawaii and devastated downtown Hilo, on the Big Island, killing 61 residents and wiping out more than 500 homes and businesses.
``If you give too many warnings and none of them materialize, then you lose your credibility,'' Wang said. ``That's something that we have to deal with and we have to improve.''
Despite some of the panic in Hawaii, public officials called the evacuation ``perfect'' and said it was a good test case that proved the system worked.