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No posting of the "British Isles Weather Outlook" on 10th May. So
this has been brought forward. Next posting expected around 20th May.

W TO SW WINDS - AVERAGE TO SLIGHTLY ABOVE AVERAGE TEMPERATURES
- SLOW MOVING PRESSURE SITUATION AT FIRST - A SPEED-UP
AFTER 7TH BRINGS A DETERIORATION

The general pressure situation for the period 1st to 10th June shows LP
to the N and W of Scotland with a belt of LP E'wards towards SW
Norway. A secondary LP on its S flank is positioned to the SW of
Ireland. HP is centred over S France and part of the W Mediterranean
and influences the extreme SE part of England. Winds are generally
from a W or SW'terly direction, sometimes strong to the W and NW of
Scotland. Generally, weather will be rainy to the NW of a line
Aberdeen to Cornwall, and dryer to the SE of that line. From 1st to
about 7th, movement of the pressure centres will be sluggish. The
Scottish LP will hardly move, and the secondary out in the Atlantic
will be reluctant to move towards the Channel. On 8th, both pressure
centres will move E'wards and cover Britain by 10th June.

Maximum temperatures will not vary much over the first 7 or 8 days but
it should become milder on 9th ahead of the LP in the W of the
country. Cooler NW winds over the near Atlantic may come into
Ireland on 10th.

The run of weather starts on 1st with LP to the NW of Scotland and a
weak trough E'wards towards SW Norway. On the S flank of the
depression, a secondary LP lies to the SW of Ireland. HP covers the
near continent and W to SW winds flow across the country. Rain showers
are expected over the N, NW and W of Britain with the dryest part in
the S and SE of England.
On 2nd, the 00Z chart on which the daily forecast is based, shows
little change from yesterday's.
On 3rd, the same.
On 4th, the same.
On 5th, the same. Perhaps the Scottish LP has moved to the N of
Scotland.
On 6th, the same. Scottish LP near N and NW Scotland.
On 7th, much the same. HP build-up over the near continent.
On 8th, Scottish LP still near N and NW Scotland, but secondary at last
starts to move towards the Channel entrance.
On 9th, LP to W and NW of Scotland with a trough E'wards towards SW
Norway. Secondary LP now near Biscay and N Spain. HP over the near
continent and mild SW winds blow across the country.
On 10th, a complex area of LP covers W Scotland down to SW England
with mild S to SW winds up the E'tern side of the country and cooler NW
winds blow down the near Atlantic to the W of Ireland. Rain showers
cover much of Britain but some clearer areas in the SE at first.

I'm still looking for a change to a warm-anticyclonic-summer-type of
weather for June. But the general chart for the next couple of
10-day-periods shows much of the same, with a trend towards cool N or
NW types for June on the West Coast, and warmer SW type for the South
East Coast. Furthermore, the trend seems to continue throughout the
summer with cool NW'erlies out in the near Atlantic, LP to the W and NW
of Scotland, HP over the near continent, and warm winds driving up
the North Sea and the near continent. The first sign of a breakdown of
this kind of general weather seems to occur in September, when the
Azores HP extends generally over the British Isles towards S
Scandinavia. But more details of that can come later.

Cheers, Keith.