Apparently, this happened effective last Sunday according to the station's Wikipedia page. I had only found out about it just now when, while watching "M*A*S*H," a red bar with information from the National Weather Service on a severe thunderstorm warning was punctuated with: "(WZME)". I looked it up and found that WSAH (a callsign that had gone back to the old "Shop At Home" days) is now WZME. So there you go.