I find that in a stable situation a lot of these times have blocking highs. Maybe more so near the solstices than at others?

If you have a farm now is the time to get your hay in for the chances are the following two spells will be unkind. You'd be taking a chance with the next one which is going to be unstable verging on wet. But it will depend on the volcanic and tropical storm activity going on.

Take a chance on a full crop or a mouldy one or get it in now and have a clean light one.

These three spells were at similar times last year:
18 to 25th May (04:35.) 25th to 31st May 25 (04:25.) And 8 to 16th June (15:56.) Should have got good silage in May with the first two (unless anyone know better?) The next one was too early for hay and the spell following should have been wet: 16 to 23rd June (17:24.)

These two should have been perfect anticyclonic ones, 23 to 30 June (11:32) and 30th June to 8th July (04:54.) I don't think they were though. I should keep records but I am busy enough with the future.

East Pacific:
Cat-1 BARBARA 28-30 MAY
Cat-1 COSME 23-27 JUN
Cat-1 DALILA 30 JUN-07 JUL
Cat-1 ERICK 04-09 JUL

West Pacific:
Cat-1 RUMBIA 28 JUN-02 JUL
Cat-4 SOULIK 07-13 JUL

Then there were the Granbury, Moore and El Reno tornadoes among a huge list of others:
http://en.wikipedia.org/wiki/Tornado..._15.E2.80.9317

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So what might be happening?
A thunder spell is the general rule of thumb for a lunar phase at 3 or 9 o'clock as witnessed last week. One hour's difference takes the planets some 15 degrees into the ocean form that. A thundery spell is a finely balanced on with lots of small anticyclones vying with even smaller cyclones.

An hour later and things seems to lean towards the anticyclones. (And an hour earlier they go the other way.) The spells for 6 and 12 are more or less the same.

But different.Instead of low cloud forming cauliflowers and castles, the low cloud just sits on us like flat, drab, grey ****. An hour either side of that is wet or dry again. An hour or so later it is the wet spell and hour earlier it is anticyclonic.

How do I know this?

God told me.