I don't know in answer to both questions.
But, this Guardian article on the fluctuating jet stream puts across some interesting ideas as to why we have experienced a number of cold winter periods over the last three years.
Thanks to Dougie, Craig, Lucy and the jet stream for the climbing and banter.
|The classic Raven Crag Gully IV 4 (5). Contender for best ice in the lakes? Photo: Craig Woods|
|Dougie starting up Chicane gully III, Devil's Kitchen. Photo: Al Monteith|
|Getting pumped on The Screen IV 4, Devil's Kitchen. Photo: Dougie Maudsley|
|Umbrellas don't just keep off the rain. Fantastic ice on South Gully, IV 5, Devils kitchen. Photo: Dougie Maudsley|
Fingers crossed for warm weather and dry rock. Definitely time for cragging!