They are filming a weather warning.
They are filming a movie.
A weather warning isn't a movie
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_film(e1) & n_warning(x2) & of(x2,x1) & n_weather(x1) & n_thing(x1))
exists e1 x1 x2.(n_thing(x1) & Theme(e1,x2) & Actor(e1,x1) & v_film(e1) & n_movie(x2))