A Motocross rider is midair with dense clouds in the sky.
it is stormy
Just because there are dense clouds in the sky does not imply it is stormy.
exists s1 s2 x1 x2 x3 x4.(n_sky(x4) & with(s1,x3) & in(x3,x4) & n_cloud(x3) & a_dense(s2) & Theme(s2,x3) & Theme(s1,x1) & a_midair(s1) & n_rider(x1) & (x1 = x2) & ne_nam_motocross(x2))
exists s1 x1.(n_thing(x1) & Theme(s1,x1) & a_stormy(s1))