"comp.john" wrote in message
...
On 2009-12-07, John Hall wrote:

The GFS Ensemble 850mb temps for London are now looking decidedly
chilly:

http://91.121.93.17/pics/MT8_London_ens.png

What do the coloured P numbers mean down the left side of the chart?
--
comp.john


.... tags identifying the individual perturbation outcome depicted on
the composite plume. P=0 is the first perturbation, P=1 is the second
and so on. The colours match the individual (thin) lines on the chart.
Useful if you're trying to identify clustering of the members of the
plume-set.

Martin.


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