I like weather apps and have demo'd many over the years. but I don't look at a radar loop on my watch. I use Radarscope or Dark Sky for looking at radar on the phone (advantage to each, Radarscope gives the best live data and Dark Sky lets you zoom out and also predict the future). I didn't even have them installed on my watch, but trying them now, DS on the watch does not show radar, RS does show a radar loop and that may work pretty well. I think RS runs faster and better on my S6 watch then it would have on my S3 or S0 watches. I use Carrot for weather on the watch because it has a nice complication, but I am not sure a subscription is worth that. For some reason, Dark Sky's prediction of rain or snow has gotten much less reliable for me over the years (and Carrot and most other apps may be using DS's model for this feature in their apps) and I haven't spent the time to figure out why or if there is anything I can do to make that work.