What it did for Mac users back in the day is what many iPhone and iPad apps do today for about the same price (free). Display weather radar for a given location. That’s Radar in Motion’s claim to fame, but it’s the perfect at-a-glance way to see local weather conditions.
One reason I’ve kept Radar in Motion running on my Mac is my long-term love affair with Dashboard Widgets. Despite all the Dock apps, Menubar apps, and Notification Center, there’s no easier way to view weather radar than moving the Mac’s onscreen pointer to a corner hotspot to bring Dashboard Widgets to the front.
You don’t even have to click. Just flick the pointer to the hotspot and get a view of the radar.
It would be useful to display current weather conditions or a forecast, but there are plenty of Mac weather apps that do just that. All I’m really concerned about most of the time is precipitation and that’s where weather radar maps shine.
The only real problem with Radar in Motion, though I’ve used it for years because it’s just a flick of the wrist to see local weather radar, is that it often seems close to Mac abandon-ware with updates about once a year, seldom with new features (weather conditions, forecasts, etc.), and the iPhone version has been discontinued.
Worse, Apple and developers have mostly left the Dashboard Widget arena for greener pastures in the Mac App Store and the iTunes App Store.