Comments by "dixon pinfold" (@dixonpinfold2582) on "Simple Flying"
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@ This statement is not entirely accurate. While blowing snow can contribute to hazardous runway conditions, it does not directly cause black ice formation in seconds on a dry runway.
The World Meteorological Organization definitions of black ice are:
"(1) A popular alternative for the term glaze. A thin sheet of ice, relatively dark in appearance, may form when light rain or drizzle falls on a road surface that is at a temperature below freezing point or, alternatively, when water already on the road surface subsequently freezes when its temperature falls below freezing point. It may also be formed when supercooled fog droplets are intercepted by buildings, fences, and vegetation.
(2) Thin, new ice on freshwater or saltwater, appearing dark in color because of its transparency, a result of its columnar grain structure."
Blowing snow alone on a dry runway would not create the necessary conditions for black ice formation. For ice to form, there needs to be a source of moisture and the right temperature conditions. The temperature at the time was around -9C (16F).
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