The people on the street need to be wearing sunscreen.
There is no forecast of rain
Just because people need to be wearing sunscreen at the moment doesn't mean there couldn't be rain later in the day.
exists p1 x1 x2 x3.(Topic(x2,p1) & exists e1 x4.(Theme(e1,x4) & Actor(e1,x2) & v_wear(e1) & n_sunscreen(x4)) & n_need(x2) & of(x2,x3) & n_street(x3) & n_people(x1) & a_topic(x1) & on(x1,x2))
exists p1 x1.-exists x2 x3.((x1 = x2) & of(x2,x3) & n_rain(x3) & n_forecast(x2))