George - We experienced this exact phenomenon in early November while moored at Kelly's Cove, Norman Island. Had a typical quiet sunset tucked in behind the point. From midnight to near dawn severe t-storms very slowly moved through. Wind shifted 180 and we were suddenly on a very, very close lee shore with 4+ foot swells coming in across the fetch from Ram Head, St John. All the skippers in the cove were on deck with flashlights throughout the night until dawn came and it just as quickly settled down.