I'm not an air traffic controller, but on a recent visit to an ATCC in the Med region, I followed a target on an approach to an airport about 150Nm away, the radar actually tracked the target (MD80) after touchdown, filtering it out once it decelerated to 60kts. I asked the controllers if their radar system received information from a closer radar head, but they assured me they didn't and said it happens quite often. Maybe the High pressure has something to do with it?