jjg70, you ask:
"If it just brings massive beach erosion, will the beaches be closed for a couple days afterward?"
I'll have to agree with big-cypress on his answer: Just find an alternative trail/road/path on to the beach of your choice.
This has happened during bigger storms in CA too, where a certain beach access point will be closed by the powers-that-be, because .... perhaps they consider it unsafe, or whatever. But as you know, the beach is endless in length, and there is no way they can close off every trail-head. You simply go north or south from there, and go in a different way. And once you're on the beach, I don't think you get booted. Surfers, for example, look for those "big wave" conditions too, and will get out on the water, at all costs, if mother nature dictates.
Or if someone really is down on the beach itself shooing people away (and not just the parking lots and entrances themselves closed), then you can merely go to neighboring beaches, where no one's shooing people away. But as I say, I think it's more a matter of trail-heads/lots closed, not that persons (who might live with houses right on the dunes, for instance) can't be on the beach itself.
