It doesn't have to be sharp, but when you have a vort just sort of going with the flow, you aren't going to get the processes going downwind of it to generate precip.
BTW, compare H5 at hr 144 on the euro to what it showed at 12z at like hr 162 yesterday. That is a massive change. Still think it whiffs, but I'd watch.
I was thinking of that one the other day. Man I wish I could see radar from that one. I know it's not the quality as it would be shortly after Doppler got installed but still.