For radar only, RadarScope is a great app, but it isn't free.
My Radar is a decent free radar app.
I have a PWS on wunderground, so I also use that app to view my station and temps at other stations in my area.
For forecasts, not many apps are very reliable, especially long-term forecasts. They only use computer programs for the forecast, so the forecast changes every 6 hours when new weather model data comes in.
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Getting ready for winter!
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