The phrase "are drifting over" is correct and usable in written English.
It can be used to describe something that is gradually moving or being carried away, often in a gentle or slow manner.
Example: "As the sun began to set, the clouds are drifting over the horizon, painting the sky in shades of orange and pink."
Alternatives: "are floating across" or "are gliding over".
The next day, petals are drifting over the grass.
Nonetheless, I found the tasting an encouraging sign that California chardonnays are drifting over from the dark side.
Prevalence estimates can vary substantially with clinical phenotype, sex, and age and are drifting over time with changing environmental risk factor exposures (www.heartstats.org); we suggest that a range of prevalences between 2 and 10% is relevant to coronary disease GWAS case series.
It is said today that creative life is drifting over the Brooklyn Bridge.
Back at the office, even Lakers fans were drifting over to offer encouragement.
The voice of the priest faltered and faded in the shuddering winds that were drifting over the water.
Guptill opens his arms and smacks one down to the long-off boundary... it looks to be drifting over the rope... but there is Dilshan to claim the catch!
But they also illustrate how the freedom of cable has been drifting over and loosening up the major networks, making them more in tune with a wider range of the culture.
Last week, a Washington talk radio host discussed what listeners should do if "a huge cloud of poison gas is drifting over the city". No nation's military has the technical ability to create a huge, lingering gas cloud: in outdoor use, chemical agents are lethal only for a few moments, because the wind quickly dilutes them.
Palls of thick smoke which rose from Vitrolles and Pennes-Mirabeau were drifting over Marseille on Wednesday.
But unfortunately their misinformation campaign is drifting over the border into Ontario, Canada where renewable energy is once again under fire from the "forces of yesterday".
