Connecting to North American Dialect

Y’all know how difficult it is to get dialects right, eh? Tossing them diphthongs around the cah can send you raht to the deep south.
As we have been told, writing in dialect (unless you are Carl Hiaasen or Mark Twain) is a perilous thing, but often a well-placed word can be enough to add the feeling of the area to your writing.
So this wonderful person, Rick Aschmann, has assembled a dialect map for North America, a map drenched in obsessive detail. It’s a fabulous way to spend a while exploring our different ways to use English.
Have a look – click on the title to see the full, AMAZING page.:
North American English Dialects, Based on Pronunciation Patterns