What is frozen fog?
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JonathanBelles
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CajunMama
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TWC's definition of freezing fog is "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"
AMS defines freezing fog as "freezing fog—A fog the droplets of which freeze upon contact with exposed objects and form a coating of rime and/or glaze." http://amsglossary.allenpress.com/gloss ... ezing-fog1
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"
AMS defines freezing fog as "freezing fog—A fog the droplets of which freeze upon contact with exposed objects and form a coating of rime and/or glaze." http://amsglossary.allenpress.com/gloss ... ezing-fog1
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senorpepr
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I meant to piggyback on this a few days ago.
From an operational standpoint, the observer will encode freezing fog (FZFG) when two conditions are met:
1) The prevailing visibility is less than 5/8mi (1km) and...
2) The temperature is less than 32°F (0°C)
If condition one is met, but not condition two, then the observer will encode fog (FG).
If the prevailing visibility is fog reducing visibility to between 6mi and 5/8mi, regardless of temperature, the observer will encode mist (BR), without a FZ descriptor.
...and now you know.
From an operational standpoint, the observer will encode freezing fog (FZFG) when two conditions are met:
1) The prevailing visibility is less than 5/8mi (1km) and...
2) The temperature is less than 32°F (0°C)
If condition one is met, but not condition two, then the observer will encode fog (FG).
If the prevailing visibility is fog reducing visibility to between 6mi and 5/8mi, regardless of temperature, the observer will encode mist (BR), without a FZ descriptor.
...and now you know.
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