I think superpilut makes the best point about inhibiting the wx radar on the ground. Linking the radar to the ground proximity sensors and the flaps is the only way that this could be acceptable. Once, back in the day while flying the J32 I was number 7 in line for takeoff and the airport was on a ground stop because of storms within the boundary. Tower calls us up and says if you guys want to depart first you can be the "pathfinder". From our perspective, the wx did not look that bad so we said sure. Once on the runway with the radar turned on and tilted up, we quickly realised why we were given priority over the heavies. (19 pax vs. 200+). I'll think twice about being a pathfinder in the future.