How did the Maui fire spread so quickly? Overgrown gully, stubborn embers may be key to probe

Melted remains of an old car tire. Heavily burned trees. A charred stump of an abandoned utility pole.

Investigators are examining these and other pieces of evidence as they seek to solve the mystery of last month’s deadly Maui wildfire: How did a small, wind-whipped fire sparked by downed power lines and declared extinguished flare up again hours later into a devastating inferno?

The answer may lie in an overgrown gully beneath Hawaiian Electric Co. power lines and something that harbored smoldering embers from the initial fire before rekindling in high winds into a wall of flame that quickly overtook the town of Lahaina, destroying thousands of structures and killing at least 97 people.

But as investigators sift through blackened debris to explain the deadliest U.S. wildfire in more than a century, one fact has become clear: Hawaiian Electric’s right-of-way was untrimmed and unkempt for years, despite being in an area classified as being at high risk for wildfires.

Aerial and satellite imagery reviewed by The Associated Press show the gully has long been choked with thick grass, shrubs, small trees and trash, which a severe summer drought turned into tinder-dry fuel for fires. Photos taken after the blaze show charred foliage in the utility’s right-of-way still more than 10 feet high.

“It was not manicured at all,” said Lahaina resident Gemsley Balagso, who has lived next to the gully for 20 years and never saw it mowed. He watched and took video Aug. 8 after the flames reignited there and were stoked by winds from a hurricane churning offshore.

“The winds were blowing 90 miles an hour (145 kmh) downhill,” Balagso told the AP. “From the time of reignition or rekindling to the time it passed my house, it was less than a minute.”