51.   Moist cloud cover and the tree canopy protect the butterflies against winds and frost.

52.   Normally, by late spring, increased cloud cover and precipitation help to suppress temperatures over the state.

53.   On Friday, officials said that cloud cover had hindered spy satellites from collecting images of the camps.

54.   Now, information seems like a thick cloud cover.

55.   Residents ventured outside as the sun strained to push through a thick cloud cover.

56.   Recently the mild weather in the upper plains has been tempered by record rainfall and its attendant cloud cover.

57.   Satellite pictures taken from outer space this week past have shown a distinct lack of cloud cover over the five Great Lakes.

58.   Scientists said radar, which can produce images through cloud cover and at night, could be useful in detecting illegal dumping, much of which happens at night.

59.   Several jet stream disturbances crossing the contiguous states will cause much of the nation to be shrouded in cloud cover.

60.   Shuttle managers also revamped their weather criteria for launch, factoring in temperature, humidity, wind speeds, cloud cover, as well as rain and lightning.