Fire and Emergency said this morning the fire had already burnt through 45ha, assisted by strong winds.
"It is already very windy and has been throughout the night and right through today," he said.
"We're sort of hanging out for a change in the weather. We're probably optimistic in expecting that, but any help we can get from that will be most welcome."
He said the fire had been running east to west along steep country to the top of a ridge.
"When that fire reached to the top of the ridge it effectively split in two – one fire front is burning back into the wind and the other fire is being pushed through by the wind and travelling in a southerly direction.
The fire was still not threatening property, but Wishnnowsky said they were ready to respond if the fire could not be contained.
"There are a couple of houses and a couple of sheds downwind of the fire, we're very conscious of that," he said.
"There are arrangements in place if we can't contain the fire before it gets close to those buildings, we will switch to a property defence-mode and make sure that we save those buildings."
He said crews were doing a "fantastic job in trying conditions" and at the moment their whole focus was on containment.
"We will have a few days mopping up afterwards … but at this stage we're hopeful that by the end of the day we'll have it fully contained."
They did not yet know how the fire started, he said.