On Nov 24, 1:53*pm, Richard Dixon wrote:
On Nov 24, 1:04*pm, Stephen Davenport wrote:

Highs and lows are only defined relative to surrounding pressure and
are a human construct. There are no absolutes. The notation in this
instance merely marks the point of highest pressure in that locale.
Plus, yes, enthusiastic labelling.

Stephen.

I would guess though that (at least in the N Hemisphere winter) that
lower central pressure "highs" are more likely further north over
Greenland/Iceland/Norway given the low mean surface pressure in this
region? ( e.g.http://badc.nerc.ac.uk/data/ecmwf-era/pics/mslp.gif)

Richard

The High is not real anyway because MSL pressures over
the Greenland icecap are meaningless. The place only has "mean sea
level" at the edges and the interior is far too high for any
extrapolation to sea level to be useful. It's probably best to regard
Greenland as a discontinuity in the MSL pattern and to regard the
isobars as formalities which do not necessarily bear any relation to
the circulation at the land surface. The same is true of Antarctica,
even more so because of the greater extent and altitude of the
continent.

Tudor Hughes, Warlingham, Surrey.