On Tue, 27 Jan 2015 12:53:02 -0800 (PST)
Colin Youngs wrote:

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.


With a temperature of -6C and dew-point of -8C, I'd say freezing fog is
unlikely.

--
Graham P Davis, Bracknell, Berks. [Retd meteorologist/programmer]
The brain is a wonderful organ. It starts working the moment you get
up and does not stop until you get into the office. – ROBERT FROST
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