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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.
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.
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.
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.
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.
sintering the bonding together of ice crystals. sleet (1) (United States) frozen raindrops that bind on impact with the ground (2) (elsewhere) a mix of rain and snow, a mix of rain and hail, or melting snow.
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.
It forms in the strong up-and-down air currents inside tall dark cumulonimbus clouds as water droplets, hail, and ice crystals collide with one another. Scientists believe that these collisions build up charges of electricity in a cloud.
The white trails are ribbons of ice crystals. As a by-product of the exhaust of aircraft engines, water vapour is trailed from the engine exhaust which adds to the local humidity of the air the aircraft is flying through, ...
The most important is through the Bergeron Process, theorized by Tor Bergeron, in which supercooled water droplets and ice crystals in a cloud interact to produce the rapid growth of ice crystals, ...
Air that is just saturated with respect to the supercooled water droplets will be supersaturated with respect to the ice crystals, resulting in vapour being deposited onto the crystal (refer to section 1.5).
It refers to ice crystals or needle-like spicules which form in supercooled water of river or stream currents which move too fast for surface ice sheets to form. In salt water is is called lolly ice.
CONTRAIL - A visible trail of vapor and / or ice crystals caused by a high-flying aircraft. The hot exhaust from an aircraft engine contains various gases, including water vapor.
Leave the bread there overnight so that it freezes and ice crystals are visible inside the plastic wrapping. Show the bread to your students and ask them how and why the ice crystals formed.
frost: 1) a cover of ice crystals produced when atmospheric water vapor is deposited directly on a surface when the temperature is below freezing, 2) the condition that exists when the temperature of the earth's surface and earth-bound objects ...
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.
Cirrus - High-level clouds (16,000 feet or more), composed of ice crystals and appearing in the form of white, delicate filaments or white or mostly white patches or narrow bands.
We now know that they are the optical result of the refraction of light from the sun or moon by ice crystals in the very high cloud (9,000 meters) called cirrus or cirrostratus.
ALTOSTRATUS This middle cloud genus is composed of water droplets, and sometimes ice crystals, In the mid-latitudes, cloud bases are generally found between 15,000 and 20,000 feet.
Cloud: Aggregate of very small droplets of water, ice crystals or the mixture of both with its base above the surface of the Earth.
Frost- the formation of thin ice crystals on the ground or other surfaces; frost develops under conditions similar to those of dew, except in temperature of the earth's surface and earthbound objects fall below thirty-two degrees Fahrenheit.
Snow A solid form of precipitation composed of ice crystals in complex hexagonal form.
Snowflake An aggregate of ice crystals that falls from a cloud.
Snow flurries Light showers of snow that fall intermittently.
Freezing fog is different from ice fog. Ice fog occurs when the fog particles turn to ice crystals and the outside temperature has to drop well below freezing for the supercooled droplets to turn to ice crystals while still in the air.
Precipitation in the form or small tabular and columnar white ice crystals formed directly from the water vapor of the air at a temperature of less than 0 degrees Celsius.
Weather Glossary Search Page
Weather Glossary Source List ...
FROST - The formation of thin ice crystals on the ground or other surfaces in the form of scales, needles, feathers, or fans. Frost develops under conditions similar to dew, except the temperatures are colder.
Melting Level: The altitude which ice crystals and snowflakes melt as they descend through the atmosphere.
Meniscus: The curved surface of the liquid at the open end of a capillary column.
Level at which ice crystals and snowflakes melt during their descent through the atmosphere.
Person who is professionally employed in the study or practice of meteorology.
Cirrus - High clouds, usually above 18,000 feet, composed of ice crystals and appearing in the form of white, delicate filaments or white or mostly white patches or narrow bands.
Clear - Sky condition of less than 1/10 cloud coverage.
Cloud - A visible aggregate of tiny water droplets and/or ice crystals in the atmosphere above the earth's surface.
Cold Front - A transition zone where a cold air mass advances and replaces a warm air mass.
CIRRUS: High clouds, usually above 18,000 feet, composed of ice crystals.
CLEAR: Sky condition of less than 1/10 cloud coverage.
CLIMATE: The historical record of average daily and seasonal weather events.
Cloud - A visible collection of very fine water droplets or ice crystals suspended in the atmosphere at altitudes from just above the ground to several miles above sea level.
cumulus clouds (tall, cotton ball) and stratus clouds (layered); these can be divided even further to 4 sub-groups describing altitude: 20,000 ft and above are the cirrus or cirro clouds (cirrocumulus, cirrostratus), composed of mostly ice crystals; ...
Rings or arcs that seem to encircle the sun or moon. They are caused by the refraction of light through the ice crystals in cirrus clouds.
stratiform: flat or layered
cumuliform: puffy or globular
cirroform: wispy, made of ice crystals ...
The rising air now cools and the moisture in that air parcel begins to condense into ice crystals and clouds form.
When enough moisture condenses out of the air, it falls in the form of snow over the water and the lee side (downwind side) of the lake.
See also: Cloud, Water, Clouds, Temperature, Air