This is just a quick post as am a bit short of time but thought this website was worth bringing to a UK audience. Daphne Watson of the Isle of Wight Birding Facebook page brought this to my attention. It is a US based website run by the Cornell Lab of Ornithology providing realtime predictions of bird migration:
Go to the 'Forecasts' page. Particularly fascinating are the posts on hurricane Sandy and the effects this has had on bird migration in the US. The website may give an idea of potential species vagrancy to the UK and is well worth UK birders keeping a close eye on.