Most Of The Fertile Summer Clouds Of The Canyon Are Of This Sort,
Massive, Swelling Cumuli, Growing Rapidly, Displaying Delicious Tones
Of Purple And Gray In The Hollows Of Their Sun-Beaten Houses,
Showering Favored Areas Of The Heated Landscape, And Vanishing In An
Hour Or Two.
Some, busy and thoughtful-looking, glide with beautiful
motion along the middle of the canyon in flocks, turning aside here
and there, lingering as if studying the needs of particular spots,
exploring side canyons, peering into hollows like birds seeding nest-places, or hovering aloft on outspread wings.
They scan all the red
wilderness, dispensing their blessings of cool shadows and rain where
the need is the greatest, refreshing the rocks, their offspring as
well as the vegetation, continuing their sculpture, deepening gorges
and sharpening peaks. Sometimes, blending all together, they weave a
ceiling from rim to rim, perhaps opening a window here and there for
sunshine to stream through, suddenly lighting some palace or temple
and making it flare in the rain as if on fire.
Sometimes, as one sits gazing from a high, jutting promontory, the sky
all clear, showing not the slightest wisp or penciling, a bright band
of cumuli will appear suddenly, coming up the canyon in single file,
as if tracing a well-known trail, passing in review, each in turn
darting its lances and dropping its shower, making a row of little
vertical rivers in the air above the big brown one. Others seem to
grow from mere points, and fly high above the canyon, yet following
its course for a long time, noiseless, as if hunting, then suddenly
darting lightning at unseen marks, and hurrying on. Or they loiter
here and there as if idle, like laborers out of work, waiting to be
hired.
Half a dozen or more showers may oftentimes be seen falling at once,
while far the greater part of the sky is in sunshine, and not a
raindrop comes nigh one. These thundershowers from as many separate
clouds, looking like wisps of long hair, may vary greatly in effects.
The pale, faint streaks are showers that fail to reach the ground,
being evaporated on the way down through the dry, thirsty air, like
streams in deserts. Many, on the other hand, which in the distance
seem insignificant, are really heavy rain, however local; these are
the gray wisps well zigzagged with lightning. The darker ones are
torrent rain, which on broad, steep slopes of favorable conformation
give rise to so-called "cloudbursts"; and wonderful is the commotion
they cause. The gorges and gulches below them, usually dry, break out
in loud uproar, with a sudden downrush of muddy, boulder-laden floods.
Down they all go in one simultaneous gush, roaring like lions rudely
awakened, each of the tawny brood actually kicking up a dust at the
first onset.
During the winter months snow falls over all the high plateau, usually
to a considerable depth, whitening the rim and the roofs of the canyon
buildings.
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