The Mid-Columbia, including the Tri-Cities, is under a red flag fire warning issued by the National Weather Service until 9 p.m. Friday.
The warning replaces the fire weather watch issued earlier this week.
Benton County is reminding residents that all burning is prohibited during red flag warnings, including permitted emergency agricultural burning.
Officials are concerned about the combination of warm temperatures, low relative humidity and breezy weather could cause any fire to spread rapidly.
The relative humidity in the Mid-Columbia is as low as 12 percent, with the lowest humidity expected through Wednesday.
Winds are expected to be light in the Tri-Cities, with gusts as strong as 18 mph Thursday night. But in more rural areas, gusts of up to 35 mph are forecast for Thursday and Friday, with the strongest winds in the afternoon and evening hours.
Highs are expected to be about 90 Wednesday and Thursday, dropping into the mid 80s Friday and Saturday in the Tri-Cities.