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High Clouds – Definition

High Clouds

A term used to signify cirriform clouds that are composed of ice crystals and generally have bases above 20,000 feet. The main types of high clouds are cirrus, cirrocumulus, and cirrostratus. This altitude applies to the temperate zone. In the polar regions, these clouds may be found at lower altitudes. In the tropics, the defining altitudes for cloud types are generally higher.

Cirriform

Clouds composed of small particles, mostly ice crystals. Because the particles are fairly widely dispersed, this usually results in relative transparency and whiteness, often producing a halo phenomena not observed in other clouds forms. These clouds generally have bases above 20,000 feet in the mid-latitudes, and are classified as high clouds. They include all varieties of cirrus, cirrocumulus, and cirrostratus clouds.

Ice Crystals

Precipitation in the form of slowly falling, singular or unbranched ice needles, columns, or plates. They make up cirriform clouds, frost, and ice fog. Also, they produce optical phenomena such as halos, coronas, and sun pillars. May be called “diamond dust.”

Cloud

A visible collection of minute particle matter, such as water droplets and/or ice crystals, in the free air. A cloud forms in the atmosphere as a result of condensation of water vapor. Condensation nuclei, such as in smoke or dust particles, form a surface upon which water vapor can condense.

Cirrus

One of the three basic cloud forms (the others are cumulus and stratus). It is also one of the three high cloud types. Cirrus are thin, wispy clouds composed of ice crystals and often appear as veil patches or strands. In the mid-latitudes, cloud bases are usually found between 20,000 to 30,000 feet, and it is the highest cloud that forms in the sky, except for the tops, or anvils, of cumulonimbus, which occasionally build to excessive heights.

Cirrostratus

A cirriform cloud that develops from cirrus spreading out into a thin layer, creating a flat sheetlike appearance. It can give the sky a slightly milky or veiled look. When viewed from the surface of the earth, these ice crystals can create a halo effect around the sun or moon. This cloud is a good precursor of precipitation, indicating it may occur within 12 to 24 hours.

Altitude

In meteorology, the measure of a height of an airborne object in respect to a constant pressure surface or above mean sea level.

Temperate Climate

Climates with distinct winter and summer seasons, typical of regions found between the Tropics of Cancer and Capricorn and the Arctic and Antarctic Circles. Considered the climate of the middle latitudes.

Poles / Polar

The poles are the geographic point at 90 degrees latitude North and South on the earth’s surface. They are equal distance from the equator. The polar region is considered to be that area between 60° and 90° latitude, both North and South.

Tropics / Tropical

The region of the earth located between the Tropic of Cancer, at 23.5 degrees North latitude, and the Tropic of Capricorn, at 23.5 degrees South latitude. It encompasses the equatorial region, an area of high temperatures and considerable precipitation during part of the year.

Service Area

Broward County: Andytown, Bonnie Loch-Woodsetter North, Boulevard Gardens, Broadview-Pompano Park, Broward Estates, Carver Ranches, Chambers Estates Chula Vista Isles, Coconut Creek, Collier Manor-Cresthaven, Cooper City, Coral Springs, Country Estates, Crystal Lake, Dania Beach, Davie, Deerfield Beach, Edgewater, Fort Lauderdale, Franklin Park, Golden Heights, Green Meadow, Hacienda Village, Hallandale Beach, Hillsboro Beach, Hillsboro Pines, Hillsboro Ranches, Hollywood, Ivanhoe Estates, Kendall Green, Lake Forest, Lauderdale-by-the-Sea, Lauderdale Lakes, Lauderhill, Lazy Lake, Leisureville, Lighthouse Point, Loch Lomond, Margate, Melrose Park, Miramar, North Andrews Gardens, North Lauderdale, Oak Point, Oakland Park, Palm Aire, Parkland, Pembroke Park, Pembroke Pines, Pine Island Ridge, Plantation, Pompano Beach, Pompano Beach Highlands, Pompano Estates, Ramblewood East, Ravenswood Estates, Riverland Village, Rock Island, Rolling Oaks, Roosevelt Gardens, Royal Palm Ranches, Sea Ranch Lakes, Southwest Ranches, St. George, Sunrise, Sunshine Acres, Sunshine Ranches, Tamarac, Tedder, Terra Mar, Utopia, Village Park, Washington Park, West Ken-Lark, West Park, Weston, Wilton Manors

Counties: Brevard, Broward, Collier, Hendry, Indian River, Lee, Martin, Miami-Dade, Monroe, Palm Beach, St Lucie

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