A cold front forecast to arrive in the Pacific Northwest by Friday, June 13 is expected to bring breezy west winds and critically low relative humidity to parts of the region — a combination that fire weather forecasters say will create elevated fire weather conditions across eastern Oregon, Washington, and portions of Idaho.

What the Forecast Shows

According to the National Interagency Coordination Center's June 5 fire weather summary, the approaching cold front will generate breezy west winds across the Columbia Basin and the Sierra Front. As the front passes, minimum relative humidity is expected to drop to the 10–20 percent range — conditions that dramatically increase the ease of fire ignition and the potential for rapid fire spread.

Wind gusts across ridge lines and exposed terrain may intensify these effects locally. Fire weather watches or red flag warnings may be issued for portions of the Columbia Basin and the Blue Mountains of northeast Oregon as the system moves through.

Southwest and Great Basin: Critical Conditions Already Active

The PNW front arrives as fire weather crews across the broader West are already dealing with extreme conditions in the Southwest and southern Great Basin. Minimum relative humidity in parts of Arizona, Utah, and Nevada has been plunging to 5–15 percent, accompanied by southwest winds of 10–20 mph with gusts to 30–35 mph. The strongest winds have been concentrated in southern Nevada, southwest Utah, and northwest Arizona — all areas at high risk for explosive fire behavior.

Fire Weather Watches vs. Red Flag Warnings: What They Mean

Residents in the Pacific Northwest should be aware of what these National Weather Service products signal:

  • Fire Weather Watch: Issued 24–72 hours in advance when conditions may develop that could lead to extreme fire behavior. A watch means conditions are possible, not guaranteed.
  • Red Flag Warning: Issued when fire weather conditions are imminent or occurring — typically a combination of low relative humidity, critical wind speeds, and dry fuels. This is the highest fire weather alert and should be treated seriously.

Grassland and Forest Fire Danger

With snowpack far below normal and an early melt-out across eastern Oregon, Washington, and Idaho, fuels are already in a critically dry state for this time of year. Annual grasses that would normally still be green in early June have cured early in many lower-elevation areas, providing a continuous fine-fuel bed that can carry fire rapidly under wind-driven conditions.

Fire managers are urging residents to:

  • Avoid any outdoor burning or use of equipment that generates sparks near dry vegetation during elevated fire weather periods.
  • Check local fire restrictions before camping, grinding, welding, or using off-road vehicles in forested or rangeland areas.
  • Monitor alerts from the Oregon Department of Forestry, Washington DNR, and the Bureau of Land Management for current fire danger levels and restriction updates.

Monitoring Resources

For current fire weather watches and warnings, visit the National Weather Service. For fire danger levels and restrictions, check with your local Oregon Department of Forestry district office, Washington DNR, or USFS ranger district.