frost

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frost

or

hoarfrost,

ice formed by the condensation of atmospheric water vapor on a surface when the temperature of the surface is below 32°F; (0°C;). In the formation of frost, a gas (water vapor) is changed directly to a solid (see dewdew,
thin film of water that has condensed on the surface of objects near the ground. Dew forms when radiational cooling of these objects during the nighttime hours also cools the shallow layer of overlying air in contact with them, causing the condensation of some water vapor.
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). Frost often appears as a light feathery deposit of ice, often of a curious and delicate pattern. The dates on which killing frosts (frost destructive to vegetation and staple agricultural products) occur vary considerably. Maps showing the growing seasongrowing season,
period during which plant growth takes place. In temperate climates the growing season is limited by seasonal changes in temperature and is defined as the period between the last killing frost of spring and the first killing frost of autumn, at which time annual
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 and the probable date of occurrence of frost may be obtained from the U.S. National Weather Service. The Weather Service stations issue warnings when frost is likely to occur; such warnings are broadcast by radio and are telegraphed or telephoned to farmers and fruitgrowers, who may protect their crops accordingly. Methods of protection vary: small flower beds and vegetable gardens are commonly protected by a screen or cloth that prevents excessive radiation from the earth and from the plants; in orchards, especially in California and Florida, simple oil-burning stoves or smudge pots placed at intervals throughout an orchard are used to heat and circulate the air sufficiently to prevent frost. Valleys are more subject to frosts than slopes, since cold air "slides" downhill and settles in depressions; orchards and citrus fruit groves are usually planted on slopes. Other factors in the occurrence of frost are altitude, latitude, proximity to large bodies of water, and other determinants of temperature. Frost, an element of climate, is an important agent of erosion. Frost heaving, an upthrust of ground caused by freezing, is a factor of consideration in engineering construction, especially in highway foundations. Frost is also a factor in the layer by layer mechanical weatheringweathering,
collective term for the processes by which rock at or near the earth's surface is disintegrated and decomposed by the action of atmospheric agents, water, and living things. Some of these processes are mechanical, e.g.
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 (exfoliation) of many types of rock masses. In England the word frost denotes freezing weather and degrees of frost means the number of degrees that the temperature falls below the freezing point.

Bibliography

See R. L. Berg and E. Wright Frost Action and Its Control (1984).

frost

[frȯst]
(hydrology)
A covering of ice in one of its several forms, produced by the sublimation of water vapor on objects colder than 32°F (0°C).

frost

The action (or result of such action) of the freezing of water vapor on a surface (e.g., the ground) that is colder than 32°F (0°C).

frost

Crystals of ice formed like dew but at a temperature below freezing.

frost

1. a white deposit of ice particles, esp one formed on objects out of doors at night
2. an atmospheric temperature of below freezing point, characterized by the production of this deposit
3. degrees below freezing point: eight degrees of frost indicates a temperature of either --8?C or 24?F

Frost

1. Sir David (Paradine). born 1939, British television presenter and executive, noted esp for political interviews
2. Robert (Lee). 1874--1963, US poet, noted for his lyrical verse on country life in New England. His books include A Boy's Will (1913), North of Boston (1914), and New Hampshire (1923)
References in periodicals archive ?
Deakin said there is a "strong likelihood that if we get the cold spell some places will see heavy snowfall.
Karachi is going to be engulfed in an extremely cold spell within two days, the forecast says.
Mr Stevens said the cold spell will last between five and seven days, perhaps a little longer, with snow.
The Added-effect Group made an attempt to separate the possible additional effect of cold spell duration from the main effect of temperature derived from the estimated daily temperature-mortality function, as previously elaborated by Gasparrini and Armstrong (2011) for heat waves.
Guava orchid contractors Khalid Memon, Zamir Agani and Manik Sethar told media that due to sudden cold spell the daily production of Guava has gone down and they are facing huge losses.
This cold spell is due to an atmospheric low moving from the Mediterranean towards the northern parts of the Arabian Peninsula and the Arabian Gulf associated with a block of cold air, they said.
Chinese travellers and foreign tourists travelling in China have had their plans disrupted by the cold spell that is blighting the country.
The capital Delhi is also affected by the cold spell, with temperatures dipping to 7C and fog disrupting flight schedules.
Summary: Morocco will have to import more cereals and raw sugar as drought and an unusually long cold spell have curbed crop cultivation, the head of the agriculture industry said on Friday.
The big upswing correlates with a really nasty cold spell in much of Europe.
The current cold spell may help but RHS fruit experts suggest that a colder and longer spell of weeks is needed to ensure that growth and flowering development is held back.
Bulgaria's capital Sofia woke up Sunday to the first snowfall this season, after a mid-October cold spell overtook the country.