Op dinsdag 27 januari 2015 18:03:03 UTC+1 schreef Richard Dixon:

On Tuesday, 27 January 2015 16:52:39 UTC, wrote:
I'm sure that if it weren't snowing it would be depositing rime :-) But yes
+SN would be good enough by definition.

I wonder if this is just the sensor getting confused. Do automatic sensors actually even record weather - if so I'm assuming the vis is so low in the heavy snow that it thought it was foggy?

I think that does happen. On the NWS METARs, visibility reduced to fog levels by precipitation often appears as fog / freezing fog (depending on temperature), I think.

http://forecast.weather.gov/data/obh...tric/KNYC.html

Total rainfall equivalent recorded at New York Central Park in the whole event seems to be 19.8 mm.

Colin Youngs
Brussels