Here in the UK I'd leave it somewhere dry and airy for about 9 months, then I'd rough it out or turn it to quarters on a bandsaw.
Why risk a split running off and wasting wood, when your drawknife and eye will tell you where the wood grain is going later?
I'd then give it another few months. I generally start working it down to staves after about 11months and the working on an actual bow after 1 year.
Over in the US you may want to put something on it too keep the bugs and borers out of it.
I once read that borers won't attack Yew... who ever wrote that nonsense didn't realise that borers don't read
Alternatively, simply ship it to me, I'll do it all for you...
Each log would give one English longbow (or AFB ) when sawn into 2 billets. Wider styles (pyramid) bow may be
trickier near impossible to get 2 from each log. (there is always more scrap that you anticipate , and it's better to have one good billet than two bad ones)
This post on my blog shows how I've maybe screwed up, being greedy... not sure yet!
http://bowyersdiary.blogspot.co.uk/2014/05/yew-from-last-june.htmlWhen you saw (or split) the half, the 2 quaters will generally open up and curve away from each other slightly.
I've just finished a Yew primitive which is near as dammit 2" at the widest (see latest blog entries...).
Note that bow has a waggle in the top limb, yet it was all done on a bandsaw, which show that sawing doesn't have to be straight or ignore the flow of the wood!
I'm glad you left the bark on, I even leave it on as I make the bow if the sapwood doesn't need reducing, it will pop off as you tiller the bow giving a perfect back (and making you jump as it goes crack
)
Del