The previous open thread has gotten full enough, so here's a new one.
We might want to kick off with this animation made by commenter A-Team:
Don't miss this -- it's happening right now, by the hour -- so head on over to 80N 150W. A huge fracture has been opening a bit east of Barrow, Alaska the last few days and it's really accelerating. The AVHRR images come up every few hours as the satellite comes over -- but they're not archived so you have to "be there" to catch them. I attached a still of the key region with a few land features labelled and an approximate distance scale as the animations is intended primarily to illustrate pack ice motion.
The imagery motions agree quite well with the Navy HYCOM ice speed and drift animation. That predicts five days out and so gives some indication of what to expect. I just attached a still for today. All the ice is moving the same way, clockwise in the Beaufort Gyre. It is just that the ice southeast of the lead just can't keep up. The ice no longer has the mechanical strength that it once did and so is fracturing under extensional tension.
Thanks for keeping an eye on this, A-Team!