normally in the past, i would fish whitley beach early on in the season when the seas are big, the bigger the better as the reef cuts off most of the big sea and its just rolls in. whitley is a chuck and move beach if you dont get anything, you have loads of marks next to each other, sometimes its just a case of moving 50 - 100yds and you could be onto the fish.
the north end of the beach next to the boat house becomes really bogged down with weed after and sometimes during a big sea, best to check the tide line before you start fishing. most of the marks mid point to south of the beach are best fished on the ebb and on the flood, the north can fish anytime as can the rex prom etc.
then blyth beach normally fishes after whitley and towards the back end of the season, although this year has proved to be different lol
there are always holes on blyth beach, they can shift a canny distance so you best going down at low water and having a look and noting where they are, they are mainly around the middle toilets area, meggies burn, and infront of the astley, then you get one around the band stand area and often around the groynes. again, best fished on the ebb and the flood, but there can be some nice mid tide holes that will fish over high tide.
on big tides you can see the sandbars and wade onto them and get into the fish if they are there.
as for conditions, you need to try, sometimes you can have a slight bump on, but the tide rip will pull you back up the beach, other times there can be a good sea running and you can hold bottom.
best to go and have a look.
there are a few marks around the north end of blyth beach as well.