Dangerous fire weather conditions continue to grip the Pacific Northwest this week, with the National Weather Service issuing Red Flag Warnings across large portions of eastern Oregon, eastern Washington, and southern Idaho. The combination of hot temperatures, critically low relative humidity, and strong winds is creating near-ideal conditions for rapid fire spread.

NWS Pendleton Red Flag Warnings

The National Weather Service Forecast Office in Pendleton, Oregon, which covers much of eastern Oregon and southeastern Washington, has been issuing successive Red Flag Warnings throughout the week. The warnings cite wind and low relative humidity as the primary drivers. One recent warning was in effect from 3 PM to 9 PM PDT on Saturday, with additional watch-to-warning upgrades issued as conditions evolved. An earlier warning issued Tuesday was in effect from 10 AM to 11 PM PDT, reflecting the persistence of critical fire weather across the region.

Conditions Driving the Warnings

Meteorologists identify several converging factors behind the elevated fire weather in the Pacific Northwest:

  • Low relative humidity: Afternoon RH values have dropped into the single digits across portions of central and eastern Washington and northeast Oregon, critically drying surface fuels.
  • Elevated winds: Afternoon outflow winds have been gusting between 20 and 35 mph in exposed locations, with higher speeds over ridges and in drainages.
  • Record-early fuel dryness: Annual grasses and fine fuels across the Columbia Basin cured several weeks ahead of historical norms, creating an unusually large and dry fuel bed heading into summer.
  • Persistent heat: Temperatures across eastern Washington have consistently exceeded 90°F, with some areas touching triple digits, further stressing vegetation and lowering fuel moisture.

Southern Idaho and Great Basin Concerns

Critical fire weather extends south and east into southern Idaho, northeastern Nevada, and northern Utah, where NIFC's Saturday situation report identified conditions conducive to additional large fire starts. Isolated afternoon thunderstorms are also possible across northern California and southeastern Oregon, raising the risk of lightning-caused ignitions in areas with cured fuels but limited precipitation.

Looking Ahead

Forecasters with the Northwest Interagency Coordination Center indicate that hot and dry conditions are expected to persist across the western third of the country, with little meaningful precipitation in the forecast for eastern Washington or Oregon. The extended outlook suggests fire weather conditions will remain elevated through at least late June, keeping the National Preparedness Level elevated and resources under continued strain.

Homeowners and landowners in fire-prone areas should avoid any burning, refrain from driving on dry grass, and ensure their fire prevention and evacuation plans are current. Any outdoor burning, including debris piles, is strongly discouraged under current conditions. Campfires should be extinguished completely before leaving any campsite.