On Sunday, 5 January 2014 10:54:52 UTC, John Hall wrote:
In article ,

"Keith (Southend)G" writes:

Thanks John for looking at some of the past SSW situations. What

does seem certain, is a change in weather type can be expected

when one occurs and I'm sure some 'others' may have a better

idea at some of the differences in SSW set-ups and a better idea of

the outcome on the ground. But we have come a long way in

meteorology over the years to a point where we monitor a

previously unknown feature and now look in anticipation at what

effect it may have in the coming weeks. All good stuff.



Yep. I suppose the next step would be to discover what triggers a SSW

(which I assume is currently unknown).

--

John Hall "He crams with cans of poisoned meat

The subjects of the King,

And when they die by thousands G.K.Chesterton:

Why, he laughs like anything." from "Song Against Grocers"



What I want to know is how they figured in previous memorable cold spells say 62/63, 78/79 & 81/82 and so on

Also as you say John what causes them and are they linked to the earths temperature?