PORTLAND, Ore. (AP) -- Fire crews on one of four major fires in southwestern Oregon may have to reassess their strategy after retreating from flames that jumped roads and fire lines Tuesday evening.

Spokeswoman Alexis West says there were about 100 firefighters on the southern flank of the Whiskey Fire in the Umpqua National Forest when the flames came rushing up from Beaver Creek.

She says it's not clear exactly what whipped up the fire, but regional microclimates cause seem to cause turbulent fire activity late in the afternoon.

She said the firefighters retreated in an orderly fashion to safety zones.

Bulldozers and, if smoke allows, aircraft were to be deployed Wednesday to see if the flames could be pushed back to the fire lines.

Otherwise, new ones may have to be drawn.

More: 40,000 acres charred as Ore. wildfires continue to burn

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