Tide at 15ft Sat morning 6am. This tide is too high for Ambleside and WB.
But at 7am Sat morning is 14ft and going down which is a little better for WB and waves may start to break to have some ride. I prefer 13ft (as Dave mentioned) on the safe side, just wait 1/2 hour and assess.
In my mind: If on Sat at 6:45am hb (website) is 0.6m then I'd go (my drive is 10 minutes). I expect downgrade at the last minute, same as the last 5+ NW forecasts (I am with Richi on the skunkage galore on NW).
But I don't know everything about it, it's just my personal view. Hope that info helps if feeling like SUPing and Acadia does not have wind in the morning.
I'd keep an eye on Friday late afternoon and Sat morning, 0.6m@hb is my limit, but If I need the exercise I would go with 0.5m. SUP is good with 0.5m if you like small waves. Don't expect much, I am still waiting for 1.1 readings, like it used to be.