Originally Posted by
FlightDetent
Same with post #3, differentiating well between
- freezing conditions (OAT < 10 deg C, active precipitation, spray, visible moisture with VIS below one mile (=FG))
- freezing fog (OAT sub zero)
Makes no difference but freezing conditions are conditions in which the outside air temperature is below +3°C (37.4F) and visible moisture in any form (such as fog with visibility below 1.5 km, rain, snow, sleet or ice crystals) or standing water, slush, ice or snow is present on the runway and
Freezing fog does not necessarily require subzero OAT. It is a suspension of numerous tiny supercooled water droplets which freeze upon impact with ground or other exposed objects, generally reducing the horizontal visibility at the earth’s surface to less than 1 km (5/8 mile).