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PORTLAND -- Tropical Storm Flossie caused some flight problems out of the Portland International Airport Monday as it beared down on the Hawaiiain islands.

As of 10 a.m. Monday, three Alaska Airlines flights had been canceled out of PDX. Those included flights to both Honolulu and Maui. No word yet on whether Hawaiian Airlines will also cancel or delay flights.

Check:PDXflight arrivals &departures

Mike McCartney, chief executive of the Hawaii Tourism Authority, said some airlines have begun to adjust flights and visitors should double-check plans.

Meantime, residents and tourists across Hawaii were bracing for heavy rains and strong winds from Flossie, while the system weakened as it approached the state.

National Weather Service officials said they expect people on the Big Island and Maui to see the brunt of the storm by midday, with wind gusts up to 60 mph, possible flooding and waves up to 18 feet high. Flossie could also bring mudslides, tornadoes and waterspouts, the forecasters said.

For the folks on the Big Island and Maui, if you're preparing your home, you should be rushing those preparations to completion, said Michael Cantin, a warning coordination meteorologist with the National Weather Service in Honolulu.

By the time you get up in the morning, the storm's going to already be there and you won't have any time, he said.

The service on Sunday issued a tropical storm warning for Oahu, Hawaii's most populous island with the city of Honolulu, to go along with previous warnings for the Big Island, Maui, Molokai and Lanai. The warning means the storm represents a threat to life and property.

Hawaii Gov. Neil Abercrombie signed an emergency proclamation in anticipation of the storm, allowing the state to use its disaster fund to pay for staff overtime, supplies and other resources. The proclamation also allows the state to call Hawaii National Guard members to duty, if necessary.

Eight emergency shelters have opened.

The U.S. Coast Guard also closed three ports - two on the Big Island where the storm is expected first and a third on Maui. College campuses and courts were also to be closed Monday on the Big Island.

Cantin said Sunday night that the system was weakening because winds in the higher levels of the atmosphere were beginning to move in more strongly, disrupting the circulation of the storm. He said wind gusts will likely be able to knock down power poles and blow away loose objects. He said people should be careful of trying to walk or drive across water if floods happen.

It takes about 6 inches of water to knock you off your feet, he said. Twelve inches to move a vehicle.

The service also issued a tropical storm watch for Kauai and Niihau, a less severe notice asking people to make a plan and pay attention to see if things get worse.

It was not immediately clear which island faced the most danger, though the Big Island - the easternmost island in the archipelago - is likely the first in Flossie's path. Flossie's center was expected to pass near the Big Island and Maui on Monday morning and then south of Oahu several hours later on Monday evening into Tuesday morning.

The storm is expected to drop 6 inches to 10 inches of rain, with higher amounts on the eastern side and less on the western side of islands. Waves of 12 to 18 feet are expected for the Big Island and Maui, with surf of 10 to 15 feet on other islands.

Despite the system weakening, the current forecast keeps Flossie as a tropical storm through Wednesday.

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