A cold upper-level low-pressure system stalled over California has shifted eastward across the Columbia and Great Basins, bringing a short window of more favorable fire weather conditions to much of the Pacific Northwest as of this week. Showers are expected across the region, with below-normal temperatures forecast for most of Oregon and western Washington.

Current Conditions

According to the National Interagency Fire Center's daily weather briefing, the displaced low is generating showers across the Pacific Northwest while driving gusty westerly winds across the Cascades into the Columbia Basin. These conditions — combined with relatively elevated humidity for early June — have temporarily reduced fire behavior across the region.

The National Weather Service Portland office confirmed the pattern through its most recent forecast, noting below-normal temperatures for much of the Oregon and Washington coast ranges and valley floors. In the high desert and eastern portions of both states, conditions are drying more rapidly.

Critical Fire Weather Elsewhere

While the Pacific Northwest catches a brief break, critical fire weather conditions remain in force for portions of the Four Corners states. The NWS fire weather outlook cited:

  • Gusty winds of 40-45 mph across New Mexico, Arizona, Utah, and Colorado
  • Relative humidity values of 7-20%, well below critical thresholds
  • A risk of isolated, mostly dry thunderstorms across eastern Nevada, southern Utah, northwest Arizona, and southwest Colorado through Thursday evening

Higher potential for thunderstorms — both wet and dry — exists across the mountains of Idaho and most of Montana, as well as along the Front Range into the Central and Southern High Plains. Dry lightning from these storms can ignite fires in remote terrain where suppression is difficult.

Gusty Winds in the Columbia Basin

Despite the cooler overall pattern, residents and land managers in the Columbia Basin and east of the Cascade crest should remain alert to gusty westerly winds associated with the low's passage. Wind events in this corridor can rapidly spread fires even in cooler temperatures when fuels are dry — as they currently are across most of eastern Oregon, eastern Washington, and southern Idaho.

Looking Ahead

Forecasters caution that this week's cooler, wetter pattern will not significantly recharge fuel moisture across most of the region. Fine fuels that dried out weeks earlier than normal due to record-deficient snowpack will need sustained precipitation over multiple events to recover — and the long-range forecast offers little hope for that kind of relief.

As the current system moves east and high pressure reasserts itself over the Pacific Northwest, fire weather conditions are expected to return. Fire managers are using this window to conduct mop-up on existing incidents, perform equipment maintenance, and pre-position resources ahead of the next high-fire-danger period.

Residents should monitor the National Weather Service at weather.gov and sign up for their local county emergency notification system for real-time fire weather watch and red flag warning alerts throughout the season.