It’s not, it’s based on distance from the radar site-radar beam elevation. Way out east it’s showing that once the radar beam reaches probably 6000 feet or so it’s picking up a mix. I don’t have the tool to show the radar beam elevation so far from the radar site but it must be about 6000 feet or so. In N NJ it’s closer to the radar site and the radar beam is at a lower elevation which is how it picks it up.