Another AM Radio Anomalous Reception

A while back I related the fascinating tale of how I get fragments of a country station from Canada when I lose my local station as I drive past the church (I think the position of the spire and the power lines interfere with my station) on Rt 7. This morning, when I pulled into my usual parking spot (middle level of a parking garage, so I'm effectively sandwiched between huge slabs of concrete) I lost my local sports radio and started getting news and traffic from Richmond, VA. Richmond is approximately 450 miles from Providence.