Strong is relative. The regional differences in my generation (40) and younger mostly come from accent and not from the vocabulary, whereas for my parents and grandparents it would be both.
There is still local vocabulary: nesh, mardy, cob, duck being obvious answers, but more of it is dying out: tuffee, sile, causie.
There is still local vocabulary: nesh, mardy, cob, duck being obvious answers, but more of it is dying out: tuffee, sile, causie.