If anything's ever really 'nailed on' surely it's almost the case with the disorganized PV??? And, IMO, it's the state of the PV (and the resulting distribution of cold air 'oop north') that's the greatest cause for optimism:
For years, we've had occassional 'good' synoptics, but without any substantial sources of cold air? This time though, if things stay as they are, when the right synoptics arise, there will be some proper cold...Has there ever been a winter (with PVs in their present state) during which there has been no cold weather at all???
That said, I agree with Steve Prudence...FI is FI because it's so very highly unlikely to materialize; and 'plausibiliy' doesn't really mean much, either, IMO. And, in answer to Dave - it could well be the case that none of the runs or ensemble members is right? :o
True enough... :o