The most recent? Not so long ago actually! The 2000 Atlantic hurricane season began with Hurricane Alberto (August 4-22) which actually was quite the healthy storm. (125 mph winds.)
The most memorable? Not many people realize, or think about this... But the most infamous late-start season was 1992. Which began with Hurricane Andrew. (This is without considering an un-named subtropical storm seen in late April.) Then again, not to alarm anyone, but this season only produced six named storms.
The point?
Patience!

