Wildfire Smoke Blankets Oshkosh, Disrupting AirVenture Arrival Plans

Some pilots heading to EAA AirVenture Oshkosh this year may be forced to delay their arrivals due to hazardous wildfire smoke drifting south from Canada.

Air quality maps from AccuWeather show a dense smoke plume — produced by what is shaping up to be a record-breaking wildfire season in Canada — extending southward across the U.S. Midwest and spreading into the Northeast. Conditions across the affected region range from "Unhealthy" to "Very Unhealthy" and, in some areas, "Hazardous."

According to the Wisconsin Department of Natural Resources fire management dashboard, 673 wildfires were actively burning across Wisconsin as of Thursday afternoon. By noon CDT on Thursday, Oshkosh's Air Quality Index (AQI) had climbed to 414 (Hazardous) due to elevated fine particulate matter (PM2.5) concentrations in the wildfire smoke.

AirVenture is scheduled to run from Monday, July 20 through Sunday, July 26 at Wittman Regional Airport (KOSH).

Reduced Visibility and Challenging Flight Conditions

METAR reports from stations stretching from Grand Forks, North Dakota to Binghamton, New York show that smoke (FU) has reduced visibility to Marginal VFR (MVFR) and even Instrument Flight Rules (IFR) conditions. Meteorologists note that the poor air quality affecting the Midwest, Pennsylvania, New York, and New England is expected to persist through the weekend as additional smoke continues to push south from Canada.

For pilots, smoke and haze present serious flight safety hazards:

• Sudden visibility drops: Smoke and haze can rapidly reduce visibility, creating a significant gap between what automated weather stations report on the ground and what pilots can actually see from the air.
• Impaired distance judgment: Haze causes the eyes to focus at infinity, making it extremely difficult — or even impossible — to accurately judge distances.
• High-altitude impact: Reduced visibility can also occur at altitude, and it is often difficult to determine exactly how high the smoke layer extends.

Pilots Must Prepare Thoroughly

Pilots planning to fly into Oshkosh should be ready for a "hide-and-seek" scenario: visibility tends to be better in the early morning hours with only a thin haze layer nearby, but conditions can deteriorate rapidly into the afternoon, bringing thick smoke that triggers IFR conditions.

Pilots who have already arrived at KOSH have been sharing PIREPs (Pilot Weather Reports) on social media, with some issuing warnings that VFR conditions are no longer present.

Not the First Time Smoke Has Hit AirVenture

This is not the first time AirVenture has been shrouded in smoke. Canadian wildfires turned the Oshkosh skies a hazy brown during portions of both the 2023 and 2024 events — producing dramatic photographic moments, but also some of the worst air quality the show has seen in recent memory.

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