Canadian wildfire smoke raises concerns for EAA AirVenture arrivals

Canadian wildfire smoke has sharply reduced visibility in parts of Wisconsin, raising concerns for pilots preparing to fly into EAA AirVenture Oshkosh ahead of the show’s opening on Monday.

The National Weather Service said wildfire smoke would continue to affect visibility and air quality across northeast Wisconsin through Friday, July 17, 2026, just as the first major wave of aircraft begins arriving at Wittman Regional Airport.

At times on July 16, visibility at Oshkosh dropped to around one mile in haze and smoke before improving later in the day. ATC cautioned that changing conditions underscore how quickly an otherwise visual arrival could become difficult or potentially unsafe, particularly for pilots flying into the congested Oshkosh area.

The National Weather Service office in Green Bay said smoke could reduce visibility to less than one mile in parts of the region. A statewide air-quality advisory has also been extended until at least 12:00 local time on Friday, with monitoring stations in Wisconsin recording Air Quality Index readings in the hazardous category.

Air traffic controllers involved in preparations for AirVenture urged pilots to remain conservative when making weather decisions.

Controllers also cautioned pilots not to attempt to thread their aircraft between thunderstorms forecast south of Oshkosh on July 17. They warned that a pilot encountering smoke while flying VFR should not assume that a pop-up IFR clearance will be available into the pilot’s preferred airport due to the heavy influx of traffic expected in the region.

IFR arrivals at Oshkosh and several surrounding airports require reservations during AirVenture because of the extraordinary amount of traffic in the region. A pilot who encounters deteriorating visibility could therefore be directed to an alternate airport.

The FAA’s special AirVenture flight procedures took effect at 12:00 local time on Thursday, July 16, and remain in place until 12:00 on July 27.

The FAA advises pilots planning to land at Oshkosh to prepare for a possible diversion to Fond du Lac, Appleton or Green Bay. Pilots are also urged to obtain a complete weather briefing, review applicable notices to airmen (Notams) and become familiar with the special procedures before departure.

There were no announced changes Thursday to the Fisk VFR arrival, the FAA’s published AirVenture procedures or the mass-arrival schedule.

The first scheduled mass arrivals are due at Oshkosh on Saturday, July 18. Up to 70 Mooneys are scheduled to arrive at 10:00 local time followed by as many as 130 Bonanzas at 13:00 and 90 Cessnas at 17:00.

Sunday’s schedule calls for up to 50 Cirrus aircraft to arrive at 10:00 and as many as 70 Cherokees at 12:00. EAA notes that all mass-arrival times remain subject to change because of weather or other factors.

Under the special procedures, most VFR aircraft arriving at Oshkosh follow a route through Ripon and Fisk before receiving runway instructions from controllers. The procedure relies heavily on pilots maintaining visual contact with landmarks and other aircraft and rocking their wings to communicate with controllers, making reduced visibility a significant concern.

Oshkosh is closed to arriving aircraft each night from 20:00 until 07:00 local time during the special-procedure period. The FAA also warns that some categories of aircraft may be temporarily turned away because of parking saturation, ground conditions, temporary flight restrictions, air shows or other activities.

Much of the smoke is coming from hundreds of wildfires burning across Canada, with some of the largest concentrations in Ontario, Manitoba and Saskatchewan. Fires in northern Minnesota are also contributing to the haze over the Upper Midwest.

Smoke from the fires has spread across the Great Lakes and into the Northeast US, producing unhealthy or hazardous air quality and reducing visibility in parts of Wisconsin, Minnesota, Michigan and Illinois.

Conditions around Oshkosh are expected to improve as winds shift heading into the weekend, and the current National Weather Service forecast does not specifically call for widespread smoke after Friday. Longer-range smoke forecasts remain uncertain, however, and another change in wind direction could bring smoke back during AirVenture next week while the fires continue to burn.

EAA AirVenture Oshkosh runs from July 20 through July 26, 2026. Thousands of aircraft are expected to fly into Wittman Regional Airport and surrounding airports before and during the event.The post Canadian wildfire smoke raises concerns for EAA AirVenture arrivals appeared first on AeroTime.

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