Philip Eden wrote:
I've just brought up-to-date my spreadsheet of North Atlantic/European
sea-level pressure, and I noted this morning (I've been waiting for this to
happen for over a week) that now - very marginally - both the westerly
and southerly indices for the last 30 days over the British Isles have
flipped negative.

In other words, the mean sea-level pressure pattern shows, just,
a flow over the BI from a northeasterly quarter.

This is the first instance of a net 30-day flow from the easterly half of
the compass since mid-April to mid-May last year, and the first from
the northeasterly quarter since April 2000.

I'm not certain what you are on about but the time frame was simiar for
me and the description of polarity was exact. I have noticed this
before; sometime just before I got a computer. That would have been in
the eighties. I can't be less vague than that.