Coastal Otago Roar timing?

Not having any experience with the coastal Otago roar I was wondering if anyone shed some light on the timing of the Roar in Coastal Otago (catlins, Wainakarua, waipori etc etc). I have heard in the past that they go a bit earlier than inland Otago? I do wonder with the abundant feed this year if that also may cause them to go a bit earlier?

Any predictions chaps?...

Catlins does seem to be a little earlier than other areas.