Cloud genera are divided into species to account for their particular shape and internal structure. Certain species only ...

Because stratus clouds form at such a low altitude (typically below 2,000 ft, but can form as high as 4,000 ft), the droplets within the clouds remain in liquid form.

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Stratus clouds at the lowest layer are very difficult to see through because they appear as big sheets in the sky, making them one of the worst to appear the day of the eclipse.

All stratus clouds have one characteristic in common: being a uniform and flat sheet of cloud matter. These clouds generate overcast skies every day, and can persist for several hours and days.

Then, you multiply that volume by the water content of the cloud based on its type, which turns out to be about 22 tons for cirrus clouds, 330 tons for stratus clouds, and 550 tons for cumulus clouds.