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    "en": "Frost (Hoar Frost)"
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    "en": [
      "Advection hoar frost,",
      "Radiation frost",
      "Rime,"
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    "en": "A hoar frost is a deposit of ice produced by the deposition of water vapour from the surrounding air and is generally crystalline in appearance (WMO, 2017). <br /> <p>WMO, 2017. <a href=\"https://cloudatlas.wmo.int/hoar-frost.html\">International Cloud Atlas: Hoar Frost. World Meteorological Organization (WMO)</a>. Accessed 1 November 2020.</p>"
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    "en": [
      "There are two types of hoar frost: hoar frost (proper) and advection hoar frost. Hoar frost: A deposit of ice that generally assumes the form of scales, needles, features or fans and which forms on objects the surface of which is sufficiently cooled, generally by nocturnal radiation, to bring about the deposition of the water vapour contained in the ambient air. Hoar frost proper is ordinarily deposited on objects at or near the ground, mainly on their horizontal surfaces. Hoar frost is observed especially during the cold part of the year when the air is calm and the sky is clear (WMO, 2017). Advection hoar frost: A deposit of ice that generally assumes crystalline form and which forms on objects, the surface of which is sufficiently cold to bring about deposition of the water vapour contained in the air coming into contact with this surface, usually through a process of advection. Advection hoar frost is deposited mainly on vertical exposed surfaces. It is observed when relatively warm damp air suddenly invades a region where the temperature of the exposed surfaces is below 0°C and below the frost-point of the advected air (WMO, 2017)."
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