This is a 5 frames per second timelapse taken from the webcam at 30 second intervals of the Nenana Ice Classic on May 20th, 2013 from 4PM to 5PM PDT (15:00-16:00 AKDT). Breakup started about 15:43 AKDT (about 16 seconds in this video) in and went very quickly. Notice the ice stopped flowing in the river at the end, suggesting an ice jam formed downstream.
Watch the video:
Julian in Wales says:
May 21, 2013 at 5:59 am
The ice break up happened on Torne River on 6 May 2013. Satellite imagery provides the opportunity to follow the ice breaks up in the Torne River.
http://enveo-42.uibk.ac.at/projects/cryoland/index.php/cryolandnews/140-tornerivericebreakup052013
At the 0:15 mark, the tripod is exiting stage left, still erect.
Correction, 0:16 .