1.   Thick cloud obscured the top of the hill.

2.   When they reached the farm Cara looked up and to her pleasure observed a white mist obscuring the top of the fells.

3.   The plane was bound from Bedford, Mass., to Newark, N.J., in overcast skies that obscured the top of the Empire State Building.

4.   Journalists at the scene could not see how badly Mayon had been disfigured following two moderate eruptions on Friday afternoon because the top was obscured by clouds and steam.