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).

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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).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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).
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

frost

Crystals of ice formed like dew but at a temperature below freezing.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved

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)
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Saudi Arabia's northern regions and cities have been regularly affected by cold spells at this time of the year.
The erratic rain coupled with the cold spell made it rough for the farmers of Rhodes grass.
He added: "If the cold spell arrives it could stay until March."
Its cold spell was first recorded at Itbayat on Jan.
The recent cold spell is likely to continue till Tuesday after which the weather will remain moderately cold' the met office said in a statement.
KARACHI: Winter rains in different parts of the country next week are likely to extend the cold spell across the nation, the Met Office has predicted.On the other hand, the weather in Karachi is expected to remain cold and dry.
The ongoing cold spell has intensified across the country wherein people have put on warm clothes to fight frosty weather conditions.
And Huddersfield weatherman Paul Stevens says the cold spell will also bring sleet and snow.
Studies that met the following four eligibility criteria were included in our review: The study a) provided information on the relation between cold spells and human mortality or morbidity; b) was an original study that had an independent study population; c) had an adequate definition of cold spell, cold wave, and/or cold surge, as specified below; and d) applied measures of mortality or morbidity that enabled the assessment of the adverse health effects.
BITTER winds and sharp frosts are set to make the West Midlands shiver as the first cold spell of winter grips the region.
Containers are best because if you get a prolonged cold spell you can move them into a more sheltered spot.