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QuickTake:
Compounding conditions — extreme heat, dry landscapes and fire danger — are stacking up in the Southern Willamette Valley, pushing the region into a volatile stretch of summer.
Summer weather is crossing a dangerous threshold in the southern Willamette Valley as heat, fire risk and drought converge.
A brief reprieve brought light rain and cooler temperatures to Eugene and Springfield in recent days, but temperatures are expected to climb rapidly through the weekend into early next week — possibly hitting triple digits. The National Weather Service has issued an extreme heat watch for the area from Sunday afternoon through Monday evening.
Meteorologists like Hannah Chandler-Cooley at the National Weather Service’s Portland office use a heat risk framework developed with the Centers for Disease Control to inform such watches. The Willamette Valley falls into one of the highest heat risk categories due to health concerns and the likelihood that overnight temperatures won’t cool enough to offer relief.
“It [the major heat risk] takes into consideration the time of year and how unusual the temperature is for that time,” Chandler-Cooley said.
An average high for this time of year is around 85 degrees, based on 30 years of National Weather Service data through 2019. Eugene and Springfield could reach 101 degrees Monday.
The National Weather Service advises people to reschedule outdoor activities. Families and people who are vulnerable, such as children and elderly, should find a space to cool off. When temperatures climb above 90 degrees, public buildings across Lane County open their doors as cooling spaces. See a list of cooling spaces.
Not just hot, but dry too
The extreme heat will bear down on land so dry, rain has struggled to soak into the hardened soil.
All of Lane County is in drought, with nearly 73% of the area classified as severe, according to the U.S. Drought Monitor. Abnormal dryness began in mid-April just a couple of weeks after historically low rain totals tapered off.
Widespread rain of more than 1 or 2 inches probably won’t arrive until late September, according to the state climatologist, Larry O’Neill.
These weather conditions exacerbate wildfire risk — a multifaceted threat driven by a growing population, development in wildland areas, and overgrown forests tied to decades of patchwork land ownership and federal policy.
Brown vegetation is brittle and zapped of any moisture. Even something as routine as driving or parking a vehicle can be a risk, because a hot exhaust system touching tinderlike grass can start a fire.
Current conditions are similar to those leading up to the Holiday Farm Fire, a wakeup call that came with 173,175 acres burned along the McKenzie River. Strong winds from the east pushed the blaze over mountain ridges and down the valley toward the foothills of Springfield, changing direction before reaching the city.
The winds, known as easterly winds, happen sometimes on the western slopes of the Cascades, when air flows rapidly down from high elevations, compressing and warming as it descends, O’Neill explained. While rare, they leave the region especially vulnerable to swift wildfires.
“These are the hot, dry, fast winds we had during the 2020 Labor Day fires,” he said. “So if we get an east wind event between now and the first fall rain, that’s going to be a very critical, dangerous time for wildfires.”
Fire danger
Thunderstorms can also happen this time of year, and weather forecasts predict that lightning could cause natural ignitions throughout the Pacific Northwest in the weeks to come.
That, combined with extreme heat and dry fuels, means that the entire state of Oregon faces above-normal wildland fire potential through September, according to the latest outlook from the National Interagency Fire Center.
In response, the center increased its preparedness level, which advises government agencies on firefighting resources. Its level four indicates a high demand for crews, engines and other equipment.
It’s why the U.S. Forest Service has issued a high fire danger status for national forests in and around Lane County, including the Umpqua and Willamette national forests. People are asked to keep campfires in designated rings within established campgrounds.
To the west, the Siuslaw National Forest remains at low fire danger, but that doesn’t mean the Coast Range is without risk.
In July, a plume of smoke rose from the Dunn Ridge Fire about 3 miles south of Linslaw. Though the fire was small — just under 3 acres — nearly 30 firefighters, six engines and a helicopter responded, according to the Oregon Department of Forestry. The fire burned in a patchwork of private land and Bureau of Land Management property.
“Fire managers say with numerous expected natural ignitions, now is the time for people to double down on fire-prevention efforts,” said Jennifer Risdal, a communications officer with the Forest Service’s Region 6, which covers Oregon and Washington.
Staying alert
Whether in the forests or within city limits, prevention means practicing fire-smart habits: fully extinguishing campfires, avoiding activities that could ignite dry brush around you, and staying alert during high-risk fire days.
Preparedness also matters — having an evacuation route planned, a go-bag ready, and signing up for OR-Alert can help people stay ready in the most volatile days of summer.
