On May 1, 9:42 am, Weatherlawyer wrote:

The Low over Britain isn't producing much in the way of rain. Quite
nice really, with some light showers. All very odd.

Whilst a Low of 999 mb is still a low, it is not much of one. The
isobars of the one around the UK at the moment:
http://www.westwind.ch/?link=ukmb,ht...racknell+13 2
extend half way over the North Atlantic.

Were the anticyclones a little less high (1032mb off Canada and 1017mb
over Scandinavia) I'd guess that activity at several volcanoes is
increased. Actually the extent of the Scandinavian one is just about
right.

It will be a week before we can find out on the Smithsonian site. One
can check up on the individual sites of likely suspects. There is a
list on he
http://www.volcano.si.edu/reports/usgs/index.cfm

A high of 1017 mb is pretty flaccid and so is a low of 999 mb. They
are pressures more commonly found at lower latitudes. And I imagine
might be likely in regions that suffer tornadoes.

So a relationship with natural disasters incorporates a pressure range
of 995 to 1020? I wonder what else they have in common besides the
same root cause. It would be nice if the NEIC site gave surface level
pressures along with mean power values.

Meanwhile I'd guess by the asymmetry that the volcanic event, if any,
is Hawaii again. If I had to guess. But we all know what they are
worth.