The phrase "a mass of clouds" is correct and usable in written English.
It can be used to describe a large, dense collection of clouds in the sky, often indicating overcast weather or an impending storm.
Example: "As we drove towards the mountains, we noticed a mass of clouds gathering ominously overhead."
Alternatives: "a cloud formation" or "a thick layer of clouds."
But, as the helicopter was ascending, a mass of clouds moved in, and the Wachowskis and the camera crew found themselves lost in whiteness.
Known as a supercell thunderstorm, it's characterized by a mass of clouds and a rotating vortex of air that can cause destructive winds, produce tornadoes, and create grapefruit-sized hail, the Los Angeles Times reports.
A mass of clouds trap light beams like swords falling to earth, until lusterless.
A mass of cloud over the country is like "a tablecloth being thrown across a table"; cold air sweeping south is like "a layer of treacle working its way across a plate of dessert".
The stunning time-lapse, which has been viewed almost 2.5 million times, shows a mass of swirling clouds tighten into a rotating column reaching out of sight into the clouds.
The wet Welsh weather is legendary and, growing up surrounded by mountains, I often felt as though a mass of black clouds sat atop the valley like a large cloth hat, dispensing a permanent wall of drizzle.
The heat continues to build underneath the pinwheel until it punches through this "cap" and turns the pinwheel on its side, creating a mass of rotating clouds called a mesocyclone that can spawn a tornado (though they don't always, and scientists aren't sure why).
I checked with my colleagues Jason Samenow and Angela Fritz of the Capital Weather Gang, who provided me the satellite images from before, during and after the address: a mass of unbroken cloud cover over the entire Washington region.
Despite the presence of the Kindly Service Station and the Peace and Loving Bar, Kisoro would be considered pleasant but easily forgettable were it not for the 4,127m volcanic peak of Muhabura that glowers overhead, its cone invariably shrouded in a mass of swirling cloud.
In it, we see an ominous mass of clouds as it approaches the foreground where the artist stands.
I raised my head, facing the center of Hiroshima to the west and saw an enormous mass of clouds which spread and climbed rapidly into the sky.
