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Old November 9th 09, 10:25 AM posted to uk.sci.weather
Jack (jack.harrison@gmail.com) Jack (jack.harrison@gmail.com) is offline
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Default Fog or Freezing Fog

I guess if it’s +0 (i.e. between 0.0 and +0.4C) it would be fog. But
if -0C (i.e. between -0.1 and -0.5C it would be freezing fog.

Metars always get confusing around zero but the difference between +0
and -0 is significant.

Jack