As we prepared to land at Denver International Airport, they told us they had “Freezing Fog” outside and there may be a delay. I had never heard of it. So, if you haven’t either, here’s the definition from the Weather Channel:
- FREEZING FOG
- Used to describe the phenomena when fog is present and the air temperature is below 0°C. It is reported as “FZFG” in an observation and on the METAR.
- Freezing fog consists of water droplets that freeze upon contact with objects they encounter, forming a layer of thin ice or rime. This happens because the water is supercooled: its temperature is below normal freezing point, but it has remained liquid. The phenomenon differs from ice fog, which is made up of tiny particles of ice. Many regions of the world can experience freezing fog, especially during the winter months, when the air temperature can drop below freezing, creating the conditions necessary to create supercooled water droplets.
Freezing Fog will leave only a thin film of frost or ice on an aircraft which nevertheless needs to be removed before flight.
- Freaky!! I had never given thought to the fact that fog could freeze.