Radar and satellite provide different perspectives of weather and are used daily by meteorologists. Sometimes it is easier to understand what you see on satellite by viewing the same data on radar.
Take a look at this satellite image from March 26, 2018, and you can see a variety of weather occurring. Severe thunderstorms are developing in North Texas and moving into Oklahoma. Other storms are weakening in Missouri. Snow is falling in Colorado near the Rocky Mountains. Moisture is flowing north from the Gulf of Mexico. If we had viewed the whole US, we would have been able to see even more weather events in action.
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The use of radar and satellite by themselves can provide a lot of useful information on weather systems. Each offers essential details that the other may not be able to see. Using them in conjunction with each other provides a complete picture of what type of weather is being observed.