Sunday, January 25, 2026

Weather reportage fudging up the fear?-----Roy W. Spencer - A question for fellow meteorologists...

With the current snowstorm, - Roy W. Spencer
I'm seeing something that has bothered me in recent years... 
  • "heavy snow" is supposed to only be reported when the visibility is reduced to 1/4 mile, and 
  • moderate snow has a threshold of 1/2 mile. 
But I am increasingly seeing these being reported with visibilities of 1 mile or more. 
What's going on?? 
I asked Grok, which says the FMH1 Handbook has not changed its definitions.
William T. Reid
If these observations are made by a certified airport observer, then they are errors. Hopefully you aren't seeing one-mile plus visibilities and heavy snow when ASOS is in AUTO mode.
Roy W. Spencer
William T. Reid I thought virtually all reports are now automated ASOS or AWOS?

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