"Hugh Newbury" wrote in message
...
I've just been to look at the std raingauge, expecting to find snow
in the top collector and nothing in the bottle. But I found nothing
in the top either, in spite of the 4.5cm of snow we had yesterday.
What am I to make of that? And how do I measure the ppn for the
records?

Puzzled of Evershot (aka Hugh)


.... most odd, but I suppose it could have been scoured out when the
wind picked up, though if your snow was the same type as ours (rather
wet), I don't like that explanation - *something* should have
survived!

Try doing a sample (upturned funnel/hold by sliding a card underneath
if it won't stick to the inside of the funnel), then melting steadily
and find out what the water equivalent is. Not ideal, but you
obviously had some PPN, and I can't think of another way of getting to
a figure.

Here in West Moors, the PPN equivalent was 2.3 mm from the snow that
fell between 0940Z & 13Z, some thereafter, but nothing to add to
total. The snow *depth* was never more than 1 cm, and this morning,
though it is technically a snow cover (for climatological purposes),
hardly comes up to 0.5 cm. We must be one of the least 'snow-worthy'
parts of the entire British Isles!

Martin.


--
Martin Rowley
West Moors, East Dorset (UK): 17m (56ft) amsl
Lat: 50.82N Long: 01.88W
NGR: SU 082 023