Seconded about pointing it up on approach... If you don't, you get a mix of weather and ground clutter. Sometimes it's worth tilting it up to max. (15degs or more) because that's where down/micro-bursts are going to be coming from.
Even with the radar significantly pointing up, you are still going to see severe stuff far enough ahead to be able to avoid it. The same can't be said of a screen full of pretty colours from ground returns.
