It's the ocean, I don't see how you can reply on a morning report that says 0-5 all day. By 10am that can all change.
Environment Canada is all I use. It's not perfect, but neither is the weather. updated 4 times through the day. Here's what it says now for North of Nanaimo.
Today Tonight and Friday - Strong wind warning in effect.
Wind light increasing to southeast 5 to 15 knots this afternoon and to southeast 15 to 20 early this evening except southwest 20 to 25 near Qualicum Beach. Wind becoming northwest 5 to 15 near midnight then becoming light near noon Friday.
Seems spot on given your on the water descriptions for today. But the 4am report could have said light winds all day, I don't know. Point being, can't leave the house expecting the last report you read to hold true for the entire day.
How often does BWD update? And where do they get their updates?