Stormfeather was downed on EMARR at 9:32pm PST 3/30/05. Location of his spawn point is roughly +5700, +900 in between the patch of trees with 3 gnomes sitting under them and the patch of trees with three static snow cougars under them.
I cannot say what time he was downed before me, only that I had been there 21 hours and 32 minutes exactly. I downed Lodizal at 7:38am PST and again at 7:03pm PST, which would put him at around a 12 hour spawn. Good luck to those who are trying this quest, its annoying but worth it in the end. Happy hunting! :)