I figure it's close enough to the next season to start thinking about what could be on the way during autumn 2013.
I've made this a sticky - if the other mods feel it should be unstickied, I won't mind
Now then... I've not seen a lot written on autumn 2013 to be honest, but there is this fantastic video from Gavin P:
http://www.gavsweathervids.com/autumn2013v2.html
Elsewhere, I've seen suggestions here and there (on wunderground, for example) that the Arctic is likely to become anomalously cold soon, signalling an early start to winter - a rare occurance in recent times. This could well have quite an impact on the autumn, with any Arctic airmasses coming our way being more potent that normal.
With the signal for a wetter than average autumn that Gavin identifies, the implied mobility, coupled with signs that the Atlantic storms could track some way south of normal, suggests to me a risk of unusually cold northerly blasts on the rear flank of storm systems, possibly with a bit of a continental component thrown in for good measure.
IF the Arctic does become anomalously cold through September and October, then what happens later on in the autumn could be a very big deal, as that's when we either see the PV ramping up and taking control, or high-latitude blocking starting to take over the Arctic instead. In the former case, the cold would tend to remain locked into the Arctic, giving the ice a real boost, with rear-flank blasts being the main source of cold for the UK. In the latter case... well, then you've potentially got exceptional cold being forced into the mid-latitudes!
So there you have my thoughts - make of them what you will. I'm not making a forecast, just discussing possibilities, as is one of the purposes of this thread
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