True - Although if the GFS got last nights temperatures completely wrong, surely it could be doing the same for this afternoon? I think it'll really be a case of watching the radar and seeing what it falls like when it gets here, I agree that warmer air does look likely to move down with it, although whether it'll be quite as warm as the GFS is suggesting is questionable.
If it does turn more to rain, I think theres a slight chance of it turning wintry again on the back edge.