Classifying Clouds

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The Old Farmer's Almanac
2013 Weather Watcher's Calendar

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Source: The 2009 Old Farmer's Almanac

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By observing clouds, you can often predict the incoming weather.  Clouds have many characteristics and are classified by altitude and type.

 

HIGH CLOUDS

Bases start above 20,000 feet, on average

Cirrus: Thin, featherlike, crystal clouds.

Cirrocumulus: Thin clouds that appear as small “cotton patches.”

Cirrostratus: Thin white clouds that resemble veils.

MIDDLE CLOUDS

Bases start at between 6,500 and 20,000 feet

Altocumulus: Gray or white layer or patches of solid clouds with rounded shapes.

Altostratus: Grayish or bluish layer of clouds that can obscure the Sun.

LOW CLOUDS

Bases start below 6,500 feet

 

Stratus: Thin, gray, sheetlike clouds with low bases; may bring drizzle or snow.

Stratocumulus: Rounded cloud masses that form in a layer.

Nimbostratus: Dark, gray, shapeless cloud layers containing rain, snow, or ice pellets.

CLOUDS WITH VERTICAL DEVELOPMENT

Form at almost any altitude and can reach to more than 39,000 feet

Cumulus: Fair-weather clouds with flat bases and dome-shape tops.

Cumulonimbus: Large, dark, vertical clouds with bulging tops that bring showers, thunder, and lightning.

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Comments

Did you know that the higher

Did you know that the higher the clouds, the finer the weather? If you spot high, wispy clouds, expect a nice day!

These pictures are great!

These pictures are great! They are so helpful to see when reading the cloud descriptions.

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