Red flag warning for Willamette Valley July 4-5

The National Weather Service in Portland has issued a red flag warning in the Willamette Valley for wind, low relative humidity, and unstable conditions, which is in effect from July 4 through 11 p.m. Wednesday, July 5, 2023.

A red flag warning indicates an increased risk of fire danger due to the combination of warm temperatures, very low humidities, and stronger winds.

A new record high temperature of 97 is predicted for Eugene Springfield on July 4, surpassing the previous record high of 95.

Winds on Tuesday, July 4 will be north 6 to 14 mph with gusts up to 30 mph. The strongest winds will be developing in the afternoon and persisting well into the night.

Winds are forecast to diminish for a few hours Wednesday morning, before west-northwest winds 6 to 14 mph with gusts up to 30 mph will develop late Wednesday afternoon into Wednesday night.

Relative humidity is expected to drop to as low as 10% Tuesday afternoon, then increase to 15-20% Wednesday afternoon. Humidity recovery will be poor to moderate Tuesday night.

The Haines index of fire danger will just touch the top of its scale, from 5 (moderate) to 6 (high). This measure combines both the instability and dryness of the air, indicating the potential for large wildfires to experience extreme fire behavior.

Conditions may be favorable for rapid spread on any new or existing fires. Extreme fire behavior is possible, especially from established fires. Outdoor burning is not recommended.

Eugene Springfield Fire has produced an evacuation zone map with numbered zones. During a wildfire event, the fire department issues ready, set, or go alerts by evacuation zone, using the terms Level 1 (get ready), Level 2, (be set), and Level 3 (go now). Know your zone, and sign up for alerts through the Lane County website.

To join nearby neighbors in preparedness activities that support you, your family, and your community, contact your local neighborhood association.