White frost

White frost

White frost is a solid deposition of ice which forms directly from water vapour contained in air. White frost forms when there is a relative humidity above 90% and a temperature below -8 °C (18 °F). The developing heat is then transferred to air by convection. White frost grows against the wind direction, since arriving windward air has a higher humidity than leeward air, but the wind must not be very strong in order not to damage the delicately built icy structures.These structures resemble a heavy coating of hoar frost with big and interlocking crystals, usually needle-shaped. This phenomenon occurs quite rarely: it is considered a kind of intermediate stage between hoar frost and rime and it is often confounded with these.

ee also

*Hoar frost
*Soft rime
*Hard rime

External links

[http://amsglossary.allenpress.com/glossary/search?p=1&query=white+frost&submit=Search AMS Glossary]


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  • white frost — Frost Frost (fr[o^]st; 115), n. [OE. frost, forst, AS. forst, frost. fr. fre[ o]san to freeze; akin to D. varst, G., OHG., Icel., Dan., & Sw. frost. [root]18. See {Freeze}, v. i.] 1. The act of freezing; applied chiefly to the congelation of… …   The Collaborative International Dictionary of English

  • White frost — White White (hw[imac]t), a. [Compar. {Whiter} (hw[imac]t [ e]r); superl. {Whitest}.] [OE. whit, AS. hw[imac]t; akin to OFries. and OS. hw[=i]t, D. wit, G. weiss, OHG. w[=i]z, hw[=i]z, Icel. hv[=i]tr, Sw. hvit, Dan. hvid, Goth. hweits, Lith.… …   The Collaborative International Dictionary of English

  • white frost — noun : frost 1c(1) * * * a heavy coating of frost. [1350 1400; ME] * * * white frost noun Hoarfrost • • • Main Entry: ↑white * * * white frost, the white, feathery crystals of ice formed when water vapor in the …   Useful english dictionary

  • white frost — /waɪt ˈfrɒst/ (say wuyt frost) noun → frost (def. 3) …  

  • white frost — a heavy coating of frost. [1350 1400; ME] * * * …   Universalium

  • Frost — is the solid deposition of water vapor from saturated air. It is formed when solid surfaces are cooled to below the dew point of the adjacent air. [cite web |url=http://www.weatherquestions.com/What causes frost.htm |title=What causes frost?… …   Wikipedia

  • Frost — (fr[o^]st; 115), n. [OE. frost, forst, AS. forst, frost. fr. fre[ o]san to freeze; akin to D. varst, G., OHG., Icel., Dan., & Sw. frost. [root]18. See {Freeze}, v. i.] 1. The act of freezing; applied chiefly to the congelation of water;… …   The Collaborative International Dictionary of English

  • Frost bearer — Frost Frost (fr[o^]st; 115), n. [OE. frost, forst, AS. forst, frost. fr. fre[ o]san to freeze; akin to D. varst, G., OHG., Icel., Dan., & Sw. frost. [root]18. See {Freeze}, v. i.] 1. The act of freezing; applied chiefly to the congelation of… …   The Collaborative International Dictionary of English

  • Frost grape — Frost Frost (fr[o^]st; 115), n. [OE. frost, forst, AS. forst, frost. fr. fre[ o]san to freeze; akin to D. varst, G., OHG., Icel., Dan., & Sw. frost. [root]18. See {Freeze}, v. i.] 1. The act of freezing; applied chiefly to the congelation of… …   The Collaborative International Dictionary of English

  • Frost lamp — Frost Frost (fr[o^]st; 115), n. [OE. frost, forst, AS. forst, frost. fr. fre[ o]san to freeze; akin to D. varst, G., OHG., Icel., Dan., & Sw. frost. [root]18. See {Freeze}, v. i.] 1. The act of freezing; applied chiefly to the congelation of… …   The Collaborative International Dictionary of English

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