Multiple red flag warnings issued by National Weather Service offices across Oregon, Washington, and Idaho this week have flagged dangerous fire weather conditions — a combination of high temperatures, critically low relative humidity, and gusty winds that has already contributed to explosive fire growth across the region.

Active Warning Areas

The NWS Seattle (SEW) office issued a red flag warning covering fire weather zones in the Columbia River Gorge and east slopes of the Cascades in both Oregon (Zone OR691) and Washington (Zone WA691) through Tuesday evening, citing gusty winds and low relative humidity. The warning extended the fire danger that had been building all week across the region.

The NWS Pendleton (PDT) office also issued a red flag warning for the Blue Mountains zone in eastern Oregon (Fire Weather Zone OR700), active from 11 AM to 9 PM Wednesday, again driven by wind and critically low humidity values.

In eastern Washington, the NWS Spokane (OTX) office maintained red flag conditions for multiple zones, while the NWS Portland office flagged the east slopes of the South Central Cascades (Zone WA695) for potential dry thunderstorm activity — a particularly dangerous combination that can spark new ignitions without delivering meaningful rainfall.

In Idaho, the NWS Pocatello office issued a red flag warning for fire weather zones 410, 413, 425, and 427 in the southern part of the state, citing gusty winds and low relative humidity.

What Red Flag Conditions Mean

A red flag warning is issued when the combination of wind speeds, low humidity, and dry fuel conditions creates an environment where wildfires can start easily and spread with extraordinary speed. During red flag conditions:

  • Any fire that ignites can grow rapidly and may be nearly impossible to control
  • Outdoor burning is strongly discouraged — and may be prohibited by local or state orders
  • New ignitions from equipment use, campfires, and debris burning pose severe risk
  • Residents near fire-prone areas should monitor evacuation alerts closely

The Role of the Heat Dome

The dangerous fire weather this week traces back to a significant mid-June heat dome that centered over Washington and Oregon earlier in the week. Temperatures across eastern Washington and Oregon climbed 10 to 20 degrees above normal, drying out already-stressed fuels and dramatically lowering relative humidity across the region.

A cold front is expected to arrive Friday, which should break the heat but may also bring gusty, erratic winds that can drive rapid fire spread before conditions finally improve over the weekend. Firefighters will remain on high alert through the transition.

Fuel Conditions

Grass and brush fuels across eastern Oregon, Washington, and southern Idaho are at or near critically dry levels for this time of year — earlier than typical. The NIFC's seasonal outlook predicted above-normal fire potential across the Pacific Northwest for June through September 2026, and this week's activity is consistent with that forecast.