PAHOA, Hawaii -- After weeks of slow, stop-and-go movement, a river of asphalt-black lava destroyed a wooden shed Tuesday as it crept closer to homes in a Big Island community.

The lava flow easily burned down the empty shed at about 7:30 a.m., several hours after entering a residential property in Pahoa Village, said Hawaii County Civil Defence Director Darryl Oliveira.

A branch of the molten stream was less than the length of a football field from a two-story house. It could hit the home later Tuesday if it continues on its current path, Oliveira estimated.

Residents of Pahoa Village, the commercial centre of the island's rural Puna district south of Hilo, have had weeks to prepare for what's been described as a slow-motion disaster. Most have either already left or are prepared to go.

At least 50 or 60 structures -- including homes and businesses -- are in the area likely to be hit.

On Tuesday morning, civil defence officials said the lava was about 457 metres from Pahoa Village Road, which runs through downtown and is one of the town's main roads.

SLOW-MOTION DISASTER

Scientists began warning the public about the lava from Kilauea volcano Aug. 22. At the time, residents were cleaning up from a tropical storm that made landfall over the Puna district.

The flow's advance has been inconsistent, ranging from about 1.8 metres to 18 metres per hour, depending on topography, said Janet Babb, a spokeswoman for the Hawaiian Volcano Observatory.

WATCHING THE FLOW

County officials are making arrangements for those living in the lava's path to be able to watch the flow destroy their homes as a means of closure.

"You can only imagine the frustration as well as ... despair they're going through," Oliveira said.

PREPARATIONS

Some schools are closing this week and sending their students to a temporary facility and to other area schools.

Crews have been building alternate roads, and officials are preparing for the lava to cut off access for some residents who are assigned to vote Nov. 4 at the Pahoa Community Center.

The centre will remain open for voting for those who can reach it. Those living on the north side of the flow who are assigned to the centre can instead go to the Hawaiian Paradise Community Center.

Voters also can cast ballots early by going to the Nanawale Community Center until Friday.

THE BRIGHT SIDE?

Terri Mulroy, who runs Kumu Aina Farm with her husband, said the lava flow, while unnerving, has a cleansing quality to it because it keeps development on the lush Hawaiian island in check.

"If it wasn't for the flow, I wouldn't be able to live here," she said. "This land would have been a golf course for the rich."