What happened
During a scheduled flight, the pilot initially determined that conditions were suitable for launch, as local fog was not visible at the launch site. However, after ascending above a ridge line, the balloon entered a patch of fog that had developed in the flight path.
As the pilot attempted to approach a preferred landing site, an unexpected low-level wind shift caused the balloon to drift approximately 90 degrees to the left. This change in direction forced the pilot to abandon the original plan and select an unplanned emergency landing site. While approaching this new location in significantly reduced visibility, the pilot spotted a tree directly in the flight path. In an effort to avoid the obstacle, the pilot performed a rapid deflation of the envelope. Despite this action, the momentum of the balloon caused the envelope to strike the tree, resulting in damage.
The investigation
The investigation examined the pilot's decision-making process regarding weather assessment and the sequence of events leading to the collision. Analysis of satellite imagery confirmed that the pilot's initial assessment was consistent with conditions at the launch site, but fog had become a factor once the balloon climbed above the ridge line. The investigation also looked into the impact of the sudden wind shift on the landing approach and the effectiveness of the pilot's emergency maneuvers.
Findings
- The encounter with fog occurred after the balloon cleared a ridge line.
- An unexpected low-level wind shift diverted the balloon from its intended landing area.
- The necessity of using an unplanned landing site, combined with low visibility, prevented the pilot from identifying and avoiding the tree in time.
- There were no injuries sustained during the incident.
- The implementation of comprehensive safety briefings and the use of proper brace positions by passengers likely prevented injury during the impact.