What happened
The pilot reported that while attempting to land, the aircraft encountered wind conditions characterized by swirling air below treetop level. This turbulent airflow caused the aircraft to strike the ground with its left wingtip. Following this impact, the aircraft departed the left side of the runway.
The incident occurred approximately 23 miles northwest of Rhinelander, Wisconsin. Meteorological data for the area at 1450 CDT indicated winds from 230 degrees at 10 knots. However, the pilot estimated that wind conditions at Crandon were from the south at 20 knots, with gusts reaching 25 knots.
The investigation
Investigation of the event focused on the atmospheric conditions present during the landing phase. Analysis confirmed the presence of significant wind shear and turbulence below treetop level, which contributed to the loss of control and subsequent ground contact.