Um, are you guys just discussing weather radar in general, or about how iFly displays ADSB radar?
ADSB weather radar doesn't inlclude any storm velocity information. It only includes echo return intensity information.
And pink can mean whatever the application developer decides it means, since there's no defined standard/requirement for display of ADSB radar data.
If you're talking about something else, it would be good to be specific, because there's a lot of room for confusion here. (ADSB-in radar, XM weather radar, internet-based weather radar from who knows what source, etc. Any of those products may start with a NEXRAD weather radar antenna, but look very different by the time you see it on whatever display you're using.)