This serve is played from the right-hander's forehand court, high and quite softly against the front wall (1). The balls descends steeply into the deep backhand corner (2), too high to comfortably play a backhand volley. It hits the back wall (3) and dies too quickly for a backhand drive (4). It's very effective, especially against average players like this blogger.
Click here for a demo of this serve on youtube, where it is unimaginatively described as a "lob serve".
