Arctic sea ice volume meltdown has come 86% of the way from Winter Maximum to a Blue Ocean Event per September 20th. The lowest volume year ever, 2017, for comparison, was at 81%.

Q: Where’s the data source for this plot?
A: Here: Arctic Sea Ice Volume for August 2019 from PIOMAS
Q: How can anyone know if there is a Blue Ocean Event?
A: Easy. Use a computer. If you have less than 1000 km³ sea ice volume in the Arctic, then you have a Blue Ocean Event.
Q: Why would I even do that?
A: Let’s say you want to know when the Arctic Ocean goes ice–free. Basing this on satellite measurements instead of gut feeling makes your conversations more interesting.

Due in large part to ongoing Collapse of Arctic Sea Ice our Frozen Earth is Going South.