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“If we have a really hot fire that cooks the vegetation that holds the soil together, we could have increased sedimentation, debris and ash flow,” Johnson said.

“So you worry about water supply being interfered with in some way, like if there was a big ash flow into one of the reservoirs, and that could cause problems,” Wara said.

Meanwhile, Nemo urged those remaining on the island to "be careful on the roads, which have become treacherous as a result of the ash flow".

Nemo is urging residents to "be careful on the roads, which have become treacherous as a result of the ash flow".

“The efforts are a little stymied because of the ash flow,” she said.