Explanation of abnormal behavior of ball lightning near the earth surface

Based on the optical model of ball lightning (BL) where BL is considered as an optical space incoherent soliton in the nonlinear optical medium in a form of the conventional terrestrial air atmosphere, we explain intriguing features of the natural ball lightning to move uniformly along the earth surface at a small distance from it ignoring strong wind. The explanation is an additional confirmation of the correctness of the optical model of ball lightning.