Red Flag Warnings and Dry Lightning Threaten Pacific Northwest as Heat Returns This Week

Fire weather conditions are deteriorating again across the Pacific Northwest after a brief mid-week cooldown, with Red Flag Warnings in effect across portions of Oregon and Washington and forecasters warning of a dangerous combination of heat, low humidity, and dry lightning through the end of the week.

What's Driving the Threat

According to the National Interagency Fire Center's August 24 weather briefing, temperatures across the Northwest that briefly moderated will warm back above normal today, with afternoon highs expected to reach 80–95°F. Minimum relative humidity is forecast to drop to 8–20% — critically dry conditions that allow fires to grow rapidly and make it nearly impossible for crews to work aggressively on fire lines during peak afternoon hours.

Of particular concern is the potential for isolated mixed wet-and-dry thunderstorms developing across southeast Oregon into the northern Great Basin. Dry lightning — storms that produce lightning but drop little to no rain — is one of the most dangerous ignition sources in the West, capable of starting dozens of new fires simultaneously in areas that are already resource-limited.

Red Flag Warnings in Effect

Red Flag Warnings have been issued for multiple regions across the Pacific Northwest over the last 72 hours, driven by the trifecta of high temperatures, low relative humidity, and gusty outflow winds. Central Oregon's fire information network reported a Red Flag Warning in effect today from noon to 10 PM, covering portions of Deschutes, Jefferson, Crook, and Wheeler counties.

Fire weather watches are also in place for parts of eastern Washington and the Oregon Cascades, where wind events associated with thunderstorm outflow have caused rapid fire spread multiple times this season.

NWCC Projects 3–5 New Large Fires This Week

The Northwest Interagency Coordination Center issued a sobering assessment ahead of this week's weather: "There is a relatively high potential for new fire starts. We're anticipating three to five new large fires from this weekend's weather events," said Kyle Sullivan with NWCC.

Officials said stopping new ignitions quickly is the top operational priority. With the PNW already at PREPAREDNESS LEVEL 4 and resources stretched thin, new large fire starts would further strain an already taxed system.

Fuel Conditions Remain Critical

Fuels across the region are at or near the driest conditions on record for late August. Dead fuel moisture levels in Eastern Oregon and Eastern Washington rangeland have been measured in the single digits in recent days — conditions where fires can spread at rates that outpace evacuation planning. Timber fuels in the Blue Mountains, Cascades, and Idaho's central ranges are also critically dry following an exceptionally dry spring and summer.

What Residents Should Do

Know your evacuation zone level and have a go-bag ready
Sign up for your county's emergency alert system
Avoid any outdoor activity that could produce a spark — no campfires, no target shooting with steel-core ammunition on dry ground
Review evacuation routes and have a plan for livestock and pets
Monitor the National Weather Service and NWCC for updated outlooks