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Ice Crystals

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A barely visible crystalline form of ice that has the shape of needles, columns or plates. Ice crystals are so small that they seem to be suspended in air.

Ice Crystals (IC) A fall of unbranched (snow crystals are branched) ice crystals in the form of needles, columns, or plates. They are also referred to as Diamond Dust.

Ice Crystals
Optical effects resulting from the interaction of light with ice crystals. These effects include: sundogs, sun pillars and halos.

Ice Crystals: 1) Hexagonal (6-sided) crystals that form upon the freezing of water, may be in one of several shapes: stars, needles, plates, columns or combinations of these forms. 2) Precipitation in the form of slowly falling, ...

ice crystals—A type of precipitation composed of unbranched crystals in the form of needles, columns, or plates; usually having a very slight downward motion, may fall from a cloudless sky.

Ice Crystals- A barely visible crystalline form of ice that has the shape of needles, columns or plates. Ice crystals are so small that they seem to be suspended in air.

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.

Ice Crystals- Frozen water vapor suspended in the air.
Instability- A state of the atmosphere in which convection takes place spontaneously, leading to cloud formation and precipitation.

White ice crystals deposited on the surface of objects that have a temperature below the freezing point of water.
Global warming ...

FROST: Ice crystals produced from water vapor that has frozen on a surface at or below 32ºF/0ºC.
FROST/FREEZE WARNING: Below-freezing temperatures are expected during the growing season and may cause significant damage to plants and crops.

If these ice crystals should fall into a warm lower cloud containing much moisture, they melt and then grow as they fall, sweeping up droplets in their path, and falling as rain.

hexagonal ice crystals with complex and often fernlike branches.
snow ...

Frost - Ice crystals that are formed by deposition of water vapor on a relatively cold surface.
Frost point - The temperature to which air must be cooled at constant pressure to achieve saturation at or below 0-C (32 -F).

Frost - White ice crystals that form on a surface, like the ground or leaves of a plant. Frost is created when the air temperature drops below freezing and the water vapor in the air freezes into ice crystals.

During one experiment, Schaefer thought the chamber was too warm and placed dry ice inside to cool it. Water vapor in the chamber formed a cloud around the dry ice. The ice crystals in the dry ice had provided a nucleus around which droplets of ...

White frost Ice crystals that form on surfaces instead of dew when the dew point is below freezing.

Precipitation of ice crystals, most of which are branched (sometimes star shaped).
Southern Oscillation Index (SOI) ...

Deposits of white ice crystals or frozen dew drops on objects on or near the ground. Formed when the surface temperature falls below freezing (0).
Fujita Scale ...

Snow - Large flat ice crystals that hook onto each other and make white flakes.

The altitude which ice crystals and snowflakes melt as they descend through the atmosphere.
Melting Point
The temperature at which a solid substance undergoes fusion, changing from a solid to a liquid state. Contrast with freezing point.

Diamond dustA fall of non-branched (snow crystals are branched) ice crystals in the form of needles, columns, or plates.

SNOW Frozen precipitation in the form of white or translucent ice crystals in complex branched hexagonal form. It most often falls from stratiform clouds, but can fall as snow showers from cumuliform ones.

Produced by reflection of moonlight from ice crystals. Parahelic circle A halo consisting of a faint white circle passing through the sun and running parallel to the horizon for as much as 360 of azimuth.

They are caused by the refraction of sunlight passing through ice crystals. They are most commonly seen during winter in the middle latitudes and are exclusively associated with cirriform clouds. They are also known as mock suns.

At the higher altitudes, they may also have some ice crystals, but they are composed mainly of water droplets. Altocumulus, altostratus, and nimbostratus are the main types of middle clouds. This altitude applies to the temperate zone.

snowPrecipitation in the form of ice crystals, mainly of intricately branched, hexagonal form and often agglomerated into snowflakes, formed directly from the freezing [deposition] of the water vapor in the air.

GlaciationThe transformation of cloud particles from water drops to ice crystals. Thus, a cumulonimbus cloud is said to have a "glaciated" upper portion.

A cloud based at the earth's surface, consisting of tiny water droplets, or under very cold conditions, ice crystals or ice fog. It is generally found in calm or low wind conditions.

Stratus does not usually produce precipitation, but when it does occur it is in the form of minute particles, such as drizzle, ice crystals, or snow grains.

Cloud particles, water droplets and ice crystals must be greatly enlarged if they are to attain sizes large enough to fall as rain or snow. Typically, it takes close to a million cloud droplets to provide enough water for each raindrop.

Aerosols are important in the atmosphere as nuclei for the condensation of water droplets and ice crystals, as participants in various chemical cycles, and as absorbers and scatterers of solar radiation, ...

Likewise, inside a cold cloud, ice crystals can also grow to a size where they can break the buoyancy and fall out of the cloud's bottom, and when they pass through a temperature of 0 C they will melt and become rain drops, ...

In many clouds, raindrops actually begin as tiny ice crystals that form when part or all of a cloud is below freezing. As the ice crystals fall inside the cloud, they may collide with water droplets that freeze onto them.

See also: See also: Cloud, Water, Clouds, Temperature, Air

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