The one I like the best is "NOAA Hi-Def Radar App. V1.21 WeatherSphere V5.1 (I hope those are the latest upgrades--I am on the road, and have not upgraded in the last week or so). There are a lot of options. Another nice feature is you tap the blue "location" buton, and it gives the altitude. Then hit the "i"--and it gives Location, and current weather, including Bar pressure, humidity, visability, emp, wind vel and direction. Sunrise sunset and due point. Then the forcast for the next 4 days. Great when traveling.