Yes, Rich, the NW wind started around 09:00h UTC on 12.06. Wind speed is between 30 and 50km/h since then.
Since there is no other significant variable available i'm aware of, i too assume this is the reason.
It strikes me as odd, i have not seen this happen even with stronger NW winds.
Therefore i think there might be another variable we are not aware of.
I'm thinking sea surface height (Lincoln vs. Baffin) could have changed too.
Edit: Also interesting in this regard, the Kane gyre is still spinning.