On Sep 12, 4:38 pm, Weatherlawyer wrote:

Yet that still left the thunder cells that came over from Europe, the
so called Spanish Plume which were -more often than not, nothing to do
with either division.

I never managed to analyse the same problem with the other times in
the list.
Wet

01:00;
04:00;
07:00;
10:00;
13:00;
16:00;
19:00;
22:00;

Becomes:
Wet And?

01:00; 04:00;
07:00; 10:00;
13:00; 16:00;
19:00; 22:00;

The actual time of a lunar phase that will place a Low Pressure area
over the UK for most of the week to which it applies is 30 minutes
past the hour. As it happens the floods in the Alps are most likely
intense when the lunar phase is on the hour for One and Seven O'
clock. Check out floods in Vaucluse and Lake Como.

Which leaves a gaping hole in the list. (Which is already lacking at
least 24 other times that need decoding.)

Fine. Let me continue:

02:00;
05:00;
08:00;
11:00;
14:00;
17:00;
20:00;
23:00;

Divides something like this:

And ?? Fine
02:00; 05:00;
08:00; 11:00;
14:00; 17:00;
20:00; 23:00;

All I can say about the above is that the centre of any highs produced
by the second column can be placed left or right of the UK if the time
is nearer the half hour to or from Five or Eleven O'clock.

What might have been expected is that the time difference is not
related to the angle of arc that is observed in the sun or moon's
position in a Nautical Almanac. One would suppose it might have. But
if the case is the same one for wet spells the half hour of time
represents 5 to 10 degrees of arc. A two to fourfold difference.