I've anchored outside surf on occasions, and have only a couple of things to add. One is that in some situations you'll get 'sneaker' waves, maybe only one or two a day, which break MUCH further offshore
This doesn't stop me using the procedure, but if I'm less than certain this cannot happen, I'll keep the boat in a situation where it can handle being pulled through green water: no forehatches open, no loose gear
or snoozing on deck
, a really good anchor set, etc etc, and CERTAINLY a competent crew on board at all times.
It actually surprising what size surf a well-set up sailing vessel can manage, provided the bow is lined up into it. I wouldn't take the risk if the wind
was either too light or too slanted. (Remember also that sneaker breaks might not run square to the beach. Talk to a local surfer)
Secondly: as regards anchoring in the channel where the rip tide drains the excess water transported above sea level by surf action.
This location can vary with tide, and might be augmented or reversed by a tidal estuary which drains through or adjacent to the surf beach.
When there's a serious amount of current
against the incoming swell, dangerous breakers might develop locally despite no changes to the general seastate.
Once again, local knowledge is desirable, but it can be hard to evaluate how reliable it is. I find those who are most forthcoming with advice tend to have the least to offer.
I'm much more relaxed around surf beaches in lifting or swing-keel yachts than deep keel
, because the former are less likely to strand, and more salvageable if they do.
Bear in mind that local opinion, however expert, may not have internalised the implications of deep draught.